802.1x and printers Networking |
- 802.1x and printers
- Just created an ACI client library for Go.
- SIP trunking providers for a Cisco UC320W switch
- ELI5: Cable toning tools — could that method be used to sniff data?
- CTRL-Z Acting Like Hitting Enter
- How do you make it work with network teams split across countries/timezones?
- Potentially spineless EVPN VxLAN. Is this even possible?
- SD-WAN Design/Vendor
- EIGRP failure... no ACK
- Terminating VXLAN L2VNIs on a Firewall/Router
- the quest of the catalyst
- BGP migration approaches
- Diagnosing mobile apps using waterfall diagrams?
- Record keeping and networking
- OSPF over IPsec + GRE
- Odd PSU behavior in Nexus 7010 chassis
- 2 WAN Policy Based Routing and NAT Issue on ISR Router
- Are there any negative effects in having one side as LAG (static) and the other side using LACP?
- Cisco 2960 Radius authentication using local account
- Routing problem with Juniper SRX550 and AWS Site2Site.
- Integrating a second Server with OpenVPN
- Cant Ping with NAT
- Corporate and Guest Wifi Networks
- Will these cables work at 10G?
| Posted: 13 Dec 2019 05:10 AM PST Half rant, half seeking advice here. We have a wired 802.1x setup with NPS dolling out dynamic VLANs, and printers have been the bane of my existence since setting this up. We're doing EAP-TLS for user workstations and PEAP for devices like printers. We use MAB we're needed as well. The problem is that printers, even if they "fully support 802.1x," fall off the network and the end users need to manually power cycle them to get them back up. This is even the case for MAB printers. For MAB at least, I see the issue. When entering power saver mode the printers flap the port and delete their MAC from the port. For 802.1x I suspect power save mode is to blame as well. Ive set the control direction for 802.1x to "in" on all printer ports but am still having intermittent issues. I've also setup a persistent ping to the printers to try and keep them alive, but it feels stupid and hacky. Setup NTP with low update intervals, switched to DHCP, and many others settings have been changed to try and keep the NICs on these damn things alive too. Anybody else run into similar issues and have any tips, or can at least sympathize with me? I'm thinking the fix is just going to be turning off all possible power save settings, and potentially keeping the persistent pings going which may make the bean counters unhappy. [link] [comments]  |
| Just created an ACI client library for Go. Posted: 13 Dec 2019 08:41 AM PST https://github.com/brightpuddle/goaci It's pre-1.0, but 98% test coverage and codifies patterns that I've been using in production ACI development for quite some time. I also wrote a moquery clone that can query the APIC over HTTP or the backup .tar.gz file, here: https://github.com/brightpuddle/requery The latter is a useful tool in and of itself, but mostly a demo of the goaci library. [link] [comments]  |
| SIP trunking providers for a Cisco UC320W switch Posted: 13 Dec 2019 01:17 PM PST So I'm looking to move our phone lines into the cloud with a SIP trunk provider. The phone switch (a UC320W) is in house connected to analog lines, but the switch is capable of using SIP trunking. I understand the concept of SIP trunking but don't have a huge background on it, and am still reading up on it. Looking through Cisco's documentation online it seems that a lot of links are no broken, as the switch is older and no longer supported. The short list of providers they had for the US is also outdated, unfortunately. I'm not immediately ready to replace the phone switch for a newer model, and I'd like to find a SIP trunk provider that our UC320W can use. Would anyone have a recommendation of providers that they know will be compatible? [link] [comments]  |
| ELI5: Cable toning tools — could that method be used to sniff data? Posted: 13 Dec 2019 06:39 AM PST I had a (literal) shower thought — I have one of these Fluke Networks IntelliTone Pro 200 Toner and Probe Kit (MT-8200-60-KIT) https://www.amazon.com/dp/B00N2S6RPY/ref=cm_sw_r_cp_api_i_Cf68DbW38DNCV And when I plug it in it generates a digital tone that can be picked up by the receiver a few feet away and through thin building materials. So that leads me to understand an electrical signal is emanating off of the wire into the air. Would it be possible to sniff data off a cable in a similar fashion with a clever enough receiver? Does normal data traversing the line emanate like the digital tone? I don't understand the physics behind the digital toner being detected feet from the wire and how data doesn't always interfere with bundled cables or gets sniffed by criminals or bad actors — Please ELI5 [link] [comments]  |
| CTRL-Z Acting Like Hitting Enter Posted: 13 Dec 2019 10:56 AM PST Please tell me this has happened to someone else. Needed to check a command syntax go it and hit control-z to back out and it ended up running the command. Thankfully nothing is wrong but its very concerning running XE 16.3.7 on a 3850. So much for read only Friday :\ Thanks everyone! [link] [comments]  |
| How do you make it work with network teams split across countries/timezones? Posted: 13 Dec 2019 03:24 AM PST I know it might not sound like a networking question based on the title, but we're a network engineering team and having an issue I believe is fairly common for larger/international organisations. I'm curious how other network engineering teams in the same situation make this work. Two thirds of the team is based in one US location, the other third of the team is based in one EU location. Everyone in the team reports to a single team manager who is in the US. This means that the EU team reports directly to a remote manager. There is a 6 hour time difference between the two teams. This provides effectively a 2.5 hour window each day for collaboration. By the time the US team rolls up at 9am, it's already 3pm in the EU. By the time the US team has their coffee and gets settled and ready for the day around 10am, it's already 4pm and the EU team heads home at 5:30pm EU time. This isn't a lot of overlap to get shit done, and most people get into their groove later in the day, not first thing in the morning. Additionally, there is a skills/focus disparity between the US and EU teams. They US team is largely focused on route/switch and the EU team is largely focused on automation. There is a third Ops team that handles most of the day-to-day operation of the network, but occasionally Ops work comes to our team and the US team largely handles this. There have been attempts at cross-pollenating skills and focus, but it's difficult to teach someone automation when you only have a 2.5 hour window, and conversely it's difficult to involve people in route/system planning when most of the meetings take place at 8-9pm for the EU folks. We are fairly siloed, which makes the weekly 1.5 hour team meeting torture for the EU folks who have to sit and listen to the US folks talk among themselves about stuff they're working on. There is also an issue with on-call work. The US team is disgruntled that they have to do all the on-call work. The EU team is only "on-call" during their normal working hours. This is because such unpaid after hours on-call work is simply expected in the US location, but is illegal in the EU location. Instead of offering double pay and/or PTO in exchange for on-call work in the EU, the company simply offered time and a half (and only for when actually responding to a call, not while chained to your phone/laptop in case something happens), which the EU employees are under no legal obligation to accept. Additionally, the company has not bothered to setup any infrastructure to record this time, let alone add extra pay to pay-checks. The network team manager is not in a position to change this as it's abstracted away to other departments (in the US location). I should also mention that the US engineers get paid substantially more than the EU team members, so there is a tradeoff. Upper management has considered installing more middle management as the solution and giving the EU team another manager to report to. This new manager would be a general manager for multiple different EU infra teams and would not be providing any direction to the EU network team. (Honestly, I don't see what the point would be. The EU team would effectively still be reporting to a remote manager and coordinating with a remote team. The new middle manager would just be a needless extra hop) I really don't know what a solution to these issues could be. It feels like there really needs to be two separate teams, one focused on RS and the other focused on automation, each driving their own initiatives. The time difference makes working together really difficult. If the EU team wants to be involved with what the US team is doing, they usually have to join remotely in the middle of the night because the US team isn't going to get up at 4am to join remotely... Are any of you on networking teams with a similar situation? How did you solve it, or is it a continuous issue? [link] [comments]  |
| Potentially spineless EVPN VxLAN. Is this even possible? Posted: 13 Dec 2019 05:42 AM PST So I've spent a week trying to wrap my head around VxLAN with EVPN and its configuration on Cisco. I'm still very much confused about many aspects of it, since the documentation and guides found on the internets are quite different and mainly meant for the standard leaf-spine architecture. Please forgive me if my use of terms in this post does not make sense at times, I'm still very green in this. I have 3 physically different locations with the following devices connected to eachother: Catalyst 9300 stack <-> Nexus9k VPC pair <-> Nexus9k VPC pair. There's already a production environment on them with plain old stretched L2 (trunk from C9k to the N9k on the other side). Currently I also have only one physical interface available for these connections on each switch (which is already configured as L2 trunk port), but in the future we will potentially upgrade this to more physical connections for redundancy. It is entirely possible this is already a show stopper for what I'm trying to achieve, since my only option is to use a vlan SVI for the VxLAN underlay, instead of a routed port, which is the suggested design in every guide I've read. I have not found any explanations yet on why I could not use an SVI, tho. I'm trying to stitch it all together with EVPN VxLAN, but as you already know, it's not the standard leaf-spine design. I could in theory configure the middle N9k as a Spine, but I need to be able to have all the switches act as VTEPs. (Am I trying to create a monster? :) From what I have read so far, I understand that it is possible to avoid using multicast entirely for BUM traffic with EVPN Control Plane (head-end replication). Just a minute ago discovered that this is not an available feature on our current C9k Fuji firmware version and will have to upgrade it, which is not a problem. At first I tried to use only one instance of (e)BGP for underlay and overlay, but could not figure out the configuration for it and had lost the guide which mentioned this possibility. Maybe it's not possible on Cisco after all. But it seemed elegant to use only one instance of BGP for all the routing. So right now I have configured OSPF for underlay, where I redistribute the Loopbacks for eBGP overlay. The neighboring for EVPN is up and running, but since I'm missing the head-end replication feature I can not test it out yet. Anyways, my question to the more wise is: Is it at all possible to achieve such a design, where we have basically 3 different switch stacks, which all act as VTEPs without any spine? Or if it is possible to make a spine (the N9k pair in-between) act as a VTEP as well? The role of the Spine is very much confusing for me still, besides route-reflecting in the iBGP design & interconnectivity between the leafs & load-balancing with ECMP. Do they have any other "special" roles? What I mean to ask is, could I not just connect leafs to leafs, if I have an EVPN connection between all of them? Also might there be any problems with EVPN on these platforms? For example, I have read Catalyst 9300 can act only as a leaf. Which is not a problem in our case, but there might be some other similar caveats I'm unaware of. Some of you may be thinking: WHYYY? We just want to move away from this stretched L2 to a flexible L3 solution. So we could stretch L2 in that L3, if need be. ;) This is not a setup for a datacenter. It's a budget setup for a small company, which houses user access ports on the Catalyst and some server access on both of the Nexus pairs. We do understand there are better (and thus more expensive) designs possible, but I hope this does not become the focus of this post. :) [link] [comments]  |
| Posted: 13 Dec 2019 04:04 PM PST Greetings all I work for a bank and I was asked by the board to start looking for 5 SD-WAN solutions (from technology perspective and Gartner report) and then shrink the list to 3. I have started looking into SD-WAN solutions to consider where my picks were : Cisco (I cannot ignore the fact that they were leaders in 2018) Velocloud Versa Silverpeak Those who I have chosen and did not know what the 5 to consider! I need your help with the aspects that I should build my decision on taking into consideration that we are a bank and security is a main concern , do I really need WAN optimization with SD-WAN? I have tried to collect reading resources , for Cisco I have found a lot , for Velo not bad information , for Versa so little (if anyone share like design guide or something) and for Silverpeak also a little bit of information. Before forgetting we have IaaS/SaaS as well , so this is something to consider Sorry for the long post but I need help : ) Cheers [link] [comments]  |
| Posted: 13 Dec 2019 11:01 AM PST I work in an Enterprise network environment and its just 3 of us for the company. We can't seem to understand why our EIGRP is failing to one location. We use a DMVPN from datacenter to all retail locations. Pretty much every retail location is identical, using Cisco 800 routers. We have backup routing that fails over to a 3G connection for when the high speed primary goes down. Same Tunnel type, just a different path to the DC VPN Concentrator. In this case, we see the primary is up, passing traffic which allows the DMVPN to build... but EIGRP just won't complete. It keeps sending HELLO, which datacenter sees and tries to establish a neighbor, but debug on Retail never shows ACK, only more HELLO attempts. Dec 13 13:45:42: EIGRP: Build goodbye tlv for 172.23.5.67 STORE-VPN-DC# Dec 13 13:45:42: %DUAL-5-NBRCHANGE: EIGRP-IPv4 111: Neighbor 172.23.5.67 (Tunnel0) is down: retry limit exceeded STORE-VPN-DC# Dec 13 13:45:45: %DUAL-5-NBRCHANGE: EIGRP-IPv4 111: Neighbor 172.23.5.67 (Tunnel0) is up: new adjacency Retail location never shows any adjacency since it never received the ACK. Backup Tunnel consistently shows HELLO back and forth as the keep alive. We're thinking the ISP may be behind it somehow... and they're bad anyways, but not sure. Thoughts? [link] [comments]  |
| Terminating VXLAN L2VNIs on a Firewall/Router Posted: 13 Dec 2019 07:15 AM PST Currently in our DC we've deployed VXLAN EVPN in a non-traditional way. Instead of using anycast gateway on our Leaf vteps , we've terminated all of our subnets/l2vnis on 1 firewall acting as the default gateway. To me i think it adds more unnecessary complexity, adds extra hops for east west traffic(especially if you have several servers behind a VIP), single point of failure, and possible scaling issues later on. The counter arguement i heard is microsegmentation capability, but is that a legitimate reason? You still cant stop VMs within the same l2VNI from talking to each other and you couldve setup ACLs on the leaf switches. Am i missing something here? Whats the benefit i dont see it. [link] [comments]  |
| Posted: 13 Dec 2019 05:03 AM PST Dear networking community, A customer of mine is currently using Cisco7606 with 2x RSP720-3CXL-GE. He recently hit the cap of IPV4 routes. He is looking for a catalyst switch where he could go over 1024k IPV4 routes. I am not able to find any model that fits the customers need, so I would love some input from you guys. Thanks in advance! [link] [comments]  |
| Posted: 13 Dec 2019 07:33 AM PST I have a network which currently uses third party L3VPN circuits for a global WAN. Each site peers with the provider over BGP and routes are tightly controlled using import/export prefix lists. I need to migrate this entire network off the third party circuits to a different VPLS (essentialy a virtual L2 switch with a primary and secondary VLAN) provider. Management would prefer this is done in phases, with each site being done seperately, rather than a big bang switchover. Makes sense. We have done the initial VPLS-facing config and we have all the necessary peering configured side-by-side for each site but are not advertising any routes at present. So, if I start advertising routes over the VPLS from one site, I would immediately go into an asymmetric routing scenario with one leg of the traffic paths going over the VPLS and the other leg going over the L3VPN and vice versa, until the other sites are migrated over. This will cause routing issues and some blackholing of traffic if new prefixes are added which were never advertised over the L3VPN in the first place. I obviously have NAT and PBR in my toolbox to mitigate these issues until the switchover is complete but I can see it getting very unwieldy very quickly. Anyone have any guidance they can provide on options for this kind of migration? I would really appreciate hearing how different approaches worked or didnt work. [link] [comments]  |
| Diagnosing mobile apps using waterfall diagrams? Posted: 13 Dec 2019 08:20 AM PST Hi all, I'm not sure if this is the right place to ask my question since it's not a traditional networking question, but more about network diagnosis at the client-side using packet captures. I'm involved in a project where I need to diagnose video streaming and some e-commerce mobile apps regarding their network performance. A waterfall diagram was suggested as one approach. So now, when we switch on the app we can get a packet capture trace. Manual inspection with Wireshark does show up issues - like latency and buffering due to occasional TCP errors, etc. But I want to automate this analysis.
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| Posted: 13 Dec 2019 03:33 PM PST This post should be acceptable per r/Networking rules, but I'm working on my CCNA and trying to learn more about networking and can not find any answers to this question. How does a network engineer keep track of each switch's configuration? For example, in a large enterprise network with hundreds of switches and various vlan databases, how is this information stored for safe keeping? [link] [comments]  |
| Posted: 13 Dec 2019 09:11 AM PST I'm the NE for a WISP. I'm trying to implement LTE failover at the access point level. I'm running a GRE tunnel over IPsec transport between my core router (pfSense) and my LTE router (RouterOS). The interfaces are configured as PTP and the OSPF metrics match on both ends. The two routers successfully form a full adjacency. When I force the interfaces down to simulate an outage, the routing table on my MikroTik LTE router contains all the expected routes with the correct cost but the gateway and outbound interface are missing. What am I missing here? Thanks. [link] [comments]  |
| Odd PSU behavior in Nexus 7010 chassis Posted: 13 Dec 2019 03:05 PM PST I have been experiencing some really strange PSU issues over this last year with our Nexus 7010s. In the span of a few months we were replacing PSU's left and right. 2 out of 3 PSU's just kept failing. I ended up having our engineering team take a look at the power and cabling, and all was tested as good. All power is fed from the same UPS as well so I would imagine other devices would also be experiencing power issues as well, and they are not. The issue led to replacing the 7010 chassis, and putting it in a new location (long term project realized early). The next day 2/3 PSUs were in the fail/shut state again. Reseating the PSUs resolves the issue for a little while, but they eventually will go back into a fail state. Usually within a few hours. The only bug I can remotely see as similar is this guy: CSCtt38629 *************************************************************************************************** Using N7K 6KW AC power supplies that have serial number starting with AZS (manufactured by Emerson) may inadvertently shutdown momentarily when power is restored to input 1 after a power failure of two or more supplies. This is seen when simulating a grid failure. See logs for example: 2011 Oct 13 19:18:00 N7K-7010-2 %PLATFORM-2-PS_CAPACITY_CHANGE: Power supply PS1 changed its capacity. possibly due to power cable removal/insertion (Serial number DTM1423007S) Conditions: Only occurs on restoring power to input 1. Input 2 does not exhibit this problem. ******************************************************************************************************* There were definitely power supplies with the AZS serial number being used here, and the only working one was the PSU with the DTM serial. Our software version is a few ahead of that listed in the bug though. I mentioned this to our local SE and he was pretty adamant it is still an issue with the buildings power. Fast forward to this monday. I was able to convince Cisco to give me a PSU without the AZS serial number...and well...all 3/3 PSU's are now reporting good power and are evenly splitting the load. Has anyone else experienced particular PSU's giving this much trouble? Replacing this ONE PSU fixed the other one too??? I have been monitoring this 7010 for a few days now and no issues. [link] [comments]  |
| 2 WAN Policy Based Routing and NAT Issue on ISR Router Posted: 13 Dec 2019 03:02 PM PST Hi, Have an ISR router with 2 WAN connections. Internet traffic from the 192.168.1.0 subnet will be routed and nated out the MAIN WAN. However, at times I may want to route and nat specific hosts out my US Cell WAN while other hosts continue to use the MAIN WAN. For example, I want host 192.168.1.5 to use the USCell WAN, but all other traffic on that subnet to use the MAIN WAN. As I understand it, If the below config is working, all I should need to do is deny 192.168.1.5 on the NAT_ACL and allow it on the NAT_USCELL_ACL. However, this config is not working. The instant I apply the route-map USCell_PBR to my MAIN LAN gi 0/0/1, I lose connectivity to internet on all hosts. As I understand it, when a packet hits Gi 0/0/1 it will be evaluated against the NAT_USCELL_ACL. If it matches traffic will be sent to next hop for US Cell. If it does not match, traffic will go out default route of 1.1.1.2 . What have I done wrong here? [link] [comments]  |
| Are there any negative effects in having one side as LAG (static) and the other side using LACP? Posted: 13 Dec 2019 06:40 AM PST I have a Cisco 2504 WLC with LAG enabled (I believe LACP is not supported) connected to bundled ports on an Aruba switch with LACP enabled. It seems to be working fine. Does this configuration have any negative effects ? Or should I disable LACP on the bundled switch ports? Thanks [link] [comments]  |
| Cisco 2960 Radius authentication using local account Posted: 13 Dec 2019 10:04 AM PST 0 I have multiple cisco switches like Nexus family and IOS family switches and now i am trying to configure centralized authentication so i have install Freeradius and freeIPA (ldap server) I have created two group net-admin and net-operator (read-only view) in LDAP and map then in freeradius in file /etc/raddb/user Configured all cisco nexus switches aaa for radius and everything working great! now comes to Cisco 2960 switches which is behaving very odd, I have configured following. When i try to login on cisco 2960 switch it failed so i have create just local account to see if it works or not so i did following now i am able to login on cisco 2960 switch using my LDAP password not foo so question is why Cisco 2960 not looking into LDAP account instead looking at local ? [link] [comments]  |
| Routing problem with Juniper SRX550 and AWS Site2Site. Posted: 13 Dec 2019 04:35 AM PST I've run into a really weird problem : I have the following scenario : PC ip : 10.10.10.11/24 ] --SRX550--Site2SiteVPNtoAWS--[ VM ip : 10.255.255.55/24 The SRX550's address on the interface connected to the PC is 10.10.10.10/24 The PC is natted. The PC can ping the VM and I get replies. However the VM can't ping the PC. I can see that there are requests packets comming from the 10.255.255.55 address on the PC's interface, but there is no response getting to the VM. I CAN ping the 10.10.10.10 address from the VM. root@srx-0> show security flow session protocol icmp Session ID: 19965, Policy name: ALLOW_ALL/4, State: Active, Timeout: 26, Valid In: 10.255.255.55/1 --> 10.10.10.11/21562;icmp, If: st0.1, Pkts: 1, Bytes: 84 Out: 10.10.10.11/21562 --> 10.255.255.55/1;icmp, If: reth1.1337, Pkts: 0, Bytes: 0 I see that the traffic is going in, I see that the traffic is going out. The firewall knows about the 10.255.255.0/24 network from the bgp : 10.255.255.0/24 *[BGP/170] 00:39:56, MED 100, localpref 100 AS path: 64543 E > to 161.252.77.9 via st0.1 [BGP/170] 00:39:49, MED 100, localpref 100 AS path: 64543 E > to 161.252.26.25 via st0.2 What am I doing wrong ? This is the whole config - > https://pastebin.com/twFzbXBf [link] [comments]  |
| Integrating a second Server with OpenVPN Posted: 13 Dec 2019 02:33 AM PST So, followings setup: Server 1 with OpenVPN installed. Internal IP: 10.10.10.1 OpenVPN config excerpt: push "route 10.10.10.0 255.255.255.0" Server 2 Internal IP: 10.10.10.2 When connecting with the OpenVPN client the route gets pushed but Server 2 is not reachable. Anyone got insight into what I could be missing? [link] [comments]  |
| Posted: 13 Dec 2019 09:03 AM PST So I have a project for my networking class in which we must use 4 hosts, a router and 2 servers, one for e-mail and one for web. Im currently working on the web server and I cant ping the web server from the hosts. The web server IP is 19.7.24.80. The professor said we need to use static NAT in order to establish a connection with the servers. I wasn't sure if I needed to do 1 command for each host so I did just in case. Here is what I have: I know there are probably a lot of unnecessary stuff here. ip nat inside source list 1 interface FastEthernet0/0 overload ip nat inside source static tcp 19.7.24.80 80 192.168.1.2 80 ip nat inside source static tcp 19.7.24.80 80 192.168.1.3 80 ip nat inside source static tcp 19.7.24.80 80 192.168.1.4 80 ip nat inside source static tcp 19.7.24.80 80 192.168.1.5 80 ip nat inside source static 19.7.24.80 192.168.2.1 ip nat inside source static tcp 19.7.24.80 80 192.168.2.1 80 when I use the show ip nat statistics I get this Total translations: 8 (7 static, 1 dynamic, 2 extended) Outside Interfaces: FastEthernet1/0 Inside Interfaces: FastEthernet0/0 Hits: 34 Misses: 2 Expired translations: 0 Dynamic mappings: What could be wrong? [link] [comments]  |
| Corporate and Guest Wifi Networks Posted: 13 Dec 2019 12:31 PM PST So, I have been tasked with making our Guest Wifi as reliable as our Corporate Wifi network. The guest Wifi is used for Employee phones and BYOD. Our Corporate Wifi is using Meraki MR52's and the Guest network is using a Netgear Nighthawk AC1900 with two extenders. People have been complaining to management that their phones keep disconnecting from the guest wifi hence the ask to make it more reliable. From what I see the two networks don't play too well together and the Meraki's pick up the guest network as interference. I suggested moving away from the Nighthawks and creating a Guest Network on the Meraki's using a splash page, ACL's and a Guest VLAN to isolate the guest network. I have been told that due to security concerns the Guest network cannot physically connect to our network equipment. So my question is has any had a scenario where they had to have two different Wifi Networks on seperate AP's in their environment and how did you make it work? [link] [comments]  |
| Will these cables work at 10G? Posted: 13 Dec 2019 01:00 AM PST Hello! [link] [comments]  |
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