Blogpost Friday! Networking |
- Blogpost Friday!
- Spectrum Business installed a router between the modem and our router, claiming its required for a static IP.
- Layer 3 Leaf/Spine without overlay network controller?
- A survey of AQM and fq_codel in enterprise bufferbloat battles
- Cisco 9300
- Load balancing a domain name according to geolocation
- Use cases for flow analytics using SFLOW/Netflow/IPFIX
- Small doubt about OSPF configuration (network vs no passive interface)
- Networking + Linux career tips?
- CUCM - SIP Trunk with password auth.
- Industrial research on networking
- Can infiniband go though a trunk?
- Trying to swap from EIGRP/VRFs to VxLAN
- VLAN or Voice VLAN for VoIP network
- Networking Setup question
- SFTP network cable
| Posted: 11 Nov 2021 04:00 PM PST It's Read-only Friday! It is time to put your feet up, pour a nice dram and look through some of our member's new and shiny blog posts. Feel free to submit your blog post and as well a nice description to this thread. Note: This post is created at 00:00 UTC. It may not be Friday where you are in the world, no need to comment on it. [link] [comments] |
| Posted: 11 Nov 2021 11:50 AM PST We're using a Ubuiqiti Dream Machine router, but when we upgraded our internet speed, Spectrum installed a router between the cable modem and our router. Our internet still functions, but we do have some strange delays, and some SaaS providers are blaming our internet for connection issues. Spectrum said this router was required to maintain a static IP address. The modem plugs into the WAN port on their router, and then a cable runs from port1 on their router, to our router's WAN port. Our router IP is 192.168.1.1, which I read was the default for theirs.
Thanks for the help. [link] [comments] |
| Layer 3 Leaf/Spine without overlay network controller? Posted: 11 Nov 2021 06:52 AM PST Hi, We are redesigning our network architecture for new locations, and we were thinking about going with a layer 3 leaf/spine fabric design. However, we have some constraints which I believe will become pain points for us. Notably, we are looking at using VMware NSX-T as the overlay network. This will work for most of our traffic, but some of our traffic will still need to be VLAN-only. Because we will be using VMware NSX-T already, we aren't too keen on also going with ACI, as this would represent extra costs for us with little benefits. However, judging by the fact that some of the traffic will not be encapsulated in VXLAN, and that these VLANs may spread across mutliple leaf pairs on a single site, we need a way to allow "layer 2" communication between these leaf switches. We also need to support multi-tenancy via VRFs. To that end, I was thinking about building an EVPN mesh across the leaf switches. My main concern regarding that is manageability (how hard is it to manage without an overlay controller) and compatibility with VMware NSX-T (can the Geneve traffic be encapsulated in VXLAN?) Does anyone have experience with a similar setup? Are we headed for a world of pain? Should we just stick to good ol' spanning-tree? [link] [comments] |
| A survey of AQM and fq_codel in enterprise bufferbloat battles Posted: 11 Nov 2021 06:54 AM PST I am curious as to what extent awareness and mitigations for the bufferbloat problem(s) have made it into enterprise gear? I'm aware of efforts in P4 for fq_codel, fq_codel being the default for most linuxes now,of the AFD algorithm in cisco's gear, comcast's fulll rollout of DOCSIS-PIE on their CMTSes ( https://arxiv.org/pdf/2107.13968.pdf ) during the covid crisis, experiments with L4S/DCTCP and SCE in the IETF, middleboxes such as libreqos and preseem, other server fixes like the adoption of TCP_NOTSENT_LOWWAT in apache traffic server recently... In particular I'd like to learn of any offload efforts or improvements being deployed at head-ends of any sort, and at overcongested interconnects. I'd also love to learn of a CISCO AFD deployment story. Is anyone tracking ecn usage, also? [link] [comments] |
| Posted: 11 Nov 2021 08:36 AM PST Hi - we are looking at a large refresh next year of 3850s. I am checking out the 9300s now. Any pros and cons for this switch? I am also looking at Juniper EX4300. Has anyone compared the two? Is there a clear winner? [link] [comments] |
| Load balancing a domain name according to geolocation Posted: 11 Nov 2021 10:46 AM PST I have a domain name. [link] [comments] |
| Use cases for flow analytics using SFLOW/Netflow/IPFIX Posted: 11 Nov 2021 01:53 PM PST Can I request the community to provide some thoughts on WHY they use flow analytics features in the network. I understand what the various leading products in this space can do, but I am curious to hear from actual network operators what they actually use it for? Is it the visibility of top applications or users? Is it identifying malicious flows? Does anyone use flow analytics for troubleshooting endpoint connectivity - for example, if an employee is having connectivity or performance issues? Basically trying to separate the marketing fluff from vendors and what it really gets used for. [link] [comments] |
| Small doubt about OSPF configuration (network vs no passive interface) Posted: 11 Nov 2021 07:49 AM PST Hi, I've this doubt about the ospf configuration on the routers of our network: These routers have 2 OSPF processes running, an OSPF 1 process that is the process utilised for transport and a local process which is supposed to terminate L2 traffic we collect on BDI interfaces and then advertise those internally. Interface on the local ospf process are then redistributed into the transport process to allow reachability from remote. My doubt is about the snippet above. To each of the BDIs being declared as "no-passive" corresponds the network below being advertised with the "network command". I am not sure why is that. I understand we want the router to be the DR for the segment, but, if we are declaring the BDI interfaces within the network as no passive, wouldn't that mean the network they are in, its gonna be advertised by OSPF as well? I am thinking the way its made like this is just an altenarive than going under each interface and write ip ospf X area X or, is there something I am missing? Thanks [link] [comments] |
| Networking + Linux career tips? Posted: 11 Nov 2021 03:40 AM PST Hi all, I've moved into networking as a career about half a year ago and things are looking good. I'm currently working in a NOC with prospects of moving to the 2nd line of support soon. I've got my CCNA, JNCIA scheduled at the end of the month and I'm studying select topics from ENCOR as the appear in my work. I also have a lot of hobbyist experience with Linux and could pass RHCSA within a month if I could carve out and hour or two every day for studying and labbing. I would love to use and expand that knowledge in my work, but, unfortunately, things are heavily siloed in my company. Unix and Wintel people know nothing about the network, we know nothing about their servers (this also means that anything more complicated requires a time consuming bridge call). In your experience, are there jobs where this particular combination of skills is needed and valued? [link] [comments] |
| CUCM - SIP Trunk with password auth. Posted: 11 Nov 2021 04:05 AM PST Good day everyone, I am trying to connect CUCM to Sip trunk provider which is using password authentication.After little googling looks like password authentication is only supported with certain IOS Routers running CUBE (Not exactly sure). For Plan B considering deploying Asterisk between CUCM and SIP Trunk, maybe it will work. If some of you had such case what options are there ? [link] [comments] |
| Industrial research on networking Posted: 11 Nov 2021 06:59 AM PST Hi all, I'm currently doing a uni assignment on a made up network and need to compare the Aruba 6300 v the Cisco 9200 I've not much experience in networking so was wondering if these are suitable to compare with each other and what in particular is worth comparing as selling points ? Any advice is greatly appreciated [link] [comments] |
| Can infiniband go though a trunk? Posted: 11 Nov 2021 06:56 AM PST Hi all. I'm not to versed on infiniband. But is there generic optics or anything for it? Can I send the signle though an mtp patch panel, pick it up on the other side and into an infiniband switch without any problem? [link] [comments] |
| Trying to swap from EIGRP/VRFs to VxLAN Posted: 11 Nov 2021 06:23 AM PST My current work setup utilises EIGRP and VRFs for layer 3 routing utilising SVI's.... I am currently investigating the feasibility of switching this setup to using VxLAN. The biggest thing that I'm questioning is that every single tutorial or piece of information on VxLAN says to use spine-leaf exclusively which my setup does not... We have a collapsed design with a number of "core" switches leading to access switches - but not all core switches connect to all access (ie- not spine-leaf). Can I achieve using VxLAN without having a spine leaf topology? I can provide more information if required, writing this out quickly before getting up for the day. [link] [comments] |
| VLAN or Voice VLAN for VoIP network Posted: 10 Nov 2021 11:42 PM PST Good day good folks. So our office is upgrading a decade old infrastructure and moving from completely unmanaged networking and traditional telephony to managed network and IP Telephony. We have two Dell PowerConnect 5400 series switches that are going to be installed in the lower and upper floor. There will be 3 VLANS - one for main network (workstations, printers, NAS, etc), one for IP cameras security system and one for IP Telephony/VoIP. The Dell switches provide two options; VLAN and Voice VLAN. As per my understanding, Voice VLAN is useful when you want to prioritize voice packets over data packets when using the same trunk (PC --> IP Phone --> Switch). But in our setup, all our IP Phones are going to be installed on separate port each and no PC will be connecting to the IP Phones. So my question is should I still use Voice VLAN for the IP Phone subnet or just simply a normal VLAN as our Phones and Workstations are on different ports each. Thanks. [link] [comments] |
| Posted: 10 Nov 2021 05:53 PM PST I wanted to get a sanity check to make sure I am not missing something for a network config. My ISP put their connection on the outside of my building and all the cat cables are run to a network box on the outside, everything is in a secure box so I am not to worried about someone plugging directly into my gear. There is only one run from the ISP box to the closet where my MX is living and the only place that would be better is outside in the ISP box. This is the only way I could think of with out pulling new cable to get an ethernet run to other rooms. I have my ISP going to a SG-350 and the port configs are as follows GE1 Access VLAN2 GE 2 Untagged VLAN2 Tagged VLAN1 GE 3 -10 Access VLAN1 MX68W Port Config Loop out from GE3 Trunk Untagged VLAN2, Tagged VLAN1 GE2 Access VLAN 2 to Internet IN GE 4-6 Access VLAN1 Is there anything I should be aware of on a security side of things having a switch on a public facing network? Management is accessible via my LAN. I don't think I am missing anything but always better to check. [link] [comments] |
| Posted: 10 Nov 2021 07:52 PM PST Hey y'all. We just ran 700ft of cable. 200 of it, we can't get working yet. Even when we run toner signals through it, the signal is weak at best. I did some digging and found that the 200 that isn't working is SFTP cable instead of regular shielded cable. There's foil on foil on foil… Am I missing something in the punch down or wiring process? We have regular Cat6 keystone jacks we are using for the wall plates. Halp? Thanks in advance! [link] [comments] |
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