Is there a point to VLANing non-VoIP data to separate from VoIP data on a passthrough phone? Networking |
- Is there a point to VLANing non-VoIP data to separate from VoIP data on a passthrough phone?
- VeloCloud Support / Technical Advice
- DNS forwarder through Cisco PAT
- What would three Cisco certified techs (CCNA) argue about?
- Little homelab - MX104 - MPLS
- Has anyone relayed DHCP over an ASA VTI?
- Output drops - egress buffer overflow?
- RIP not adding routing entries
- IPv6 question
- Quick question regarding drops
- Wendell Odom's OCG and TCP Retransmission logic
- Out of Order Packets
| Is there a point to VLANing non-VoIP data to separate from VoIP data on a passthrough phone? Posted: 03 Mar 2019 09:01 AM PST Generic question that would apply to any passthrough VoIP device, not any specific brand. Since there is one cable between patch panel and phone, with all data to the PC passing through, is there a point to put traffic destined for the phone on one VLAN and traffic destined to the PC on another? LAN is gigabit to the desk, I'm not responding to any detected problems, just "helpful advice" from people who insist that data should be tagged as VoIP or the other kind of data because "that's just the best way to do it". [link] [comments]  |
| VeloCloud Support / Technical Advice Posted: 03 Mar 2019 01:51 PM PST I'm having trouble finding ANY support for hosting our own gateways. Does anyone here know that well enough to assist? Also, the documentation on HOW to do anything is kind of ....non existent. From what I can see in the documentation, we should be able to dynamic rout between our host routers and the gateways using OSPF, but I got an email response saying only BGP and static routes are supported..... [link] [comments]  |
| DNS forwarder through Cisco PAT Posted: 03 Mar 2019 12:09 PM PST I'm having trouble with resolving public DNS in my GNS3 home lab. The device chain is PC -> IOSvL2 switch -> pfSense FW -> [g0/0] Cisco 7200 router g[1/0] -> Home DSL -> Internet I have standard PAT set up on the Cisco 7200: g0/0 ip nat inside g1/0 ip nat outside access-list 1 permit any ip nat inside source list 1 interface g1/0 overload I can ping 8.8.8.8 from the PC and I can see the traffic being translated on the router. When I do an nslookup to 8.8.8.8 I don't see any translation. I can see the request in Wireshark pre-router but not post-router. What do I need to do to get DNS traffic NAT'd like the ICMP traffic? [link] [comments]  |
| What would three Cisco certified techs (CCNA) argue about? Posted: 02 Mar 2019 09:04 PM PST Sounds like the start of a joke but my company won't let me hire any network people for my team and we can only use vendors. They say it is because the network engineers in the past have always argued and called each other morons and said they are configuring equipment wrong. We have a fairly simple network with 15 offices across three states using AT&T MPLS. 1 Cisco ISR 4321 & 1 Cisco Catalyst 2960 at each location. So my question is what could they have been arguing about that is worth calling each other morons? My assumption is that it is just what VLAN numbers to use or if we should administratively disable ports or use port security? I am just curious if I could convince my management that they were arguing just to cause office drama and we can trust Cisco certified techs. They are all trained to a best practices standard. Any help is greatly appreciated. If this post is not allowed please remove it. Edit: I agree it would not take a full time person to manage our network. I did simplify it a little because I did not want to creat a wall of text bigger than it was already. We are opening five new locations in the next year and I have been told that trend will probably continue into the future. Given that I am tryng to plan for the future. I am thinking it might be nice to not be 100% reliant on vendors. [link] [comments]  |
| Posted: 03 Mar 2019 11:10 AM PST Hi, Posted in /r/homelab originally but might not be the best R for this question. I'm running mostly Juniper gear at home to extend my skills in networking. Currently 2xEX3300 and 1xEX2300-C + vSRX where I terminate L3 at one of the EX3300 and do routing-instances up to my vSRX (with OSPF and OSPFv3) - nothing fancy. I have one MX104 not in use and I'm thinking of using it to start learning MPLS. Perhaps at start just to create my own WAN between the MX104 and one or two vMX, or together with the two EX3300's and my vSRX. I'd like to "eat my own dog food" and do my network labs as realistic as possible, so I'm also thinking I'd route my two ISP connection via the MX104 and advertise them with BGP-4 down to my vSRX. This does not make a whole lot of sense as I won't be able to receive a BGP feed from any of my ISPs (yet) but it would allow me to start learning BGP. So MPLS and BGP-4 are the use-cases I've been thinking about. What else can I explore? I know this might be out of scope but it's not about how I'd would configure my home router either... [link] [comments]  |
| Has anyone relayed DHCP over an ASA VTI? Posted: 03 Mar 2019 07:50 AM PST I haven't found any Cisco documentation to support that this is possible and I haven't found any examples of anyone attempting this. I'm trying to use DHCP relay to delivery traffic over a virtual tunnel interface with this topology: DHCP Clients <-> ASA <-> WAN VTI <-> IOS Router <-> DHCP Server I have attempted to lab this in VIRL, but ran into a bug that prevents an ASA to originate VTI traffic. I can't easily test with real equipment so I wanted to see if anyone has done this before pursuing that. EDIT: After about 10 hours of testing and packet tracing/captures I confirmed with Cisco it is not a supported use of VTI. Thank you everyone for your feedback. [link] [comments]  |
| Output drops - egress buffer overflow? Posted: 03 Mar 2019 02:21 AM PST We have a juniper ex3400 switch connected to a juniper MX router via a 1gb link. The switch then has a bunch of servers connected via 1gb ports. A lot of traffic from the servers passes through to the MX router. At busy times we are seeing a lot of output drops on the uplink to the router, pretty obvious it's due to congestion and RED kicking in. Would aggregating more ports into a bundle for the uplink to the router resolve this or would we have to look at getting a switch with larger egress buffers? [link] [comments]  |
| RIP not adding routing entries Posted: 03 Mar 2019 07:33 AM PST So I'm testing out a lab as part of my reading material and its testing RIP adding a route entry in to the routing table. The config goes as: R1 interface Loopback0 ip address 172.16.1.1 255.255.255.0 ! interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.240 duplex auto speed auto media-type rj45 no cdp enable ! router rip version 1 network 172.16.0.0 network 192.168.1.0 ! R2 interface Loopback0 ip address 172.16.1.2 255.255.255.0 ! interface GigabitEthernet0/0 ip address 192.168.1.2 255.255.255.240 duplex auto speed auto media-type rj45 no cdp enable ! router rip version 1 network 172.16.0.0 ! However when I do show ip route on R1 I'm only getting the connected entries and none from RIP, any ideas why? [link] [comments]  |
| Posted: 02 Mar 2019 10:22 PM PST I'm looking at beginning to roll out IPv6 at work. DHCP server is running on Windows Server 2019. [link] [comments]  |
| Quick question regarding drops Posted: 02 Mar 2019 07:39 PM PST So I have a question, it doesnt really need an indepth answer. I was wondering how most people deal with purely glass wall presentation rooms. As in can you have a drop in the floor? do you just run cables in there? Just trying to get ideas on whats generally accepted Thanks in advance --Edit-- Thank you very much everyone for the ideas, a lot of them are neat and some of them are something I never really though of. Thanks again all [link] [comments]  |
| Wendell Odom's OCG and TCP Retransmission logic Posted: 02 Mar 2019 05:21 PM PST I've grabbed Wendell Odom's CCNA book set to begin studying for the CCNA and I'm a bit confused about how he explains how the TCP retransmission system works.
First of all he lists the sequence numbers as sequential integers, but I'm guessing he's doing that to simplify things since it's so early in the book? Because it's my understanding that TCP sequence numbers don't work that way at all. But my real confusion comes in where he explains that the client notices it gets segment 3 before it gets segment 2, and the client explicitly requests the specific segment it thinks it's missing. Isn't TCP retransmission logic all based on the sender's side, based on ack timeout? And wouldn't receiving segments out of order happen naturally occasionally anyway? This book comes highly recommended practically everywhere, so is there just something I'm missing here? I've looked around to find a case where TCP works the way he explains it, but all I can find is to the contrary. This is the newest edition of this book, that was release after they updated the CCNA. [link] [comments]  |
| Posted: 02 Mar 2019 09:58 PM PST So with a recent post on Fortnite reddit, they've brought to light that the UE4 engine has had some problems with out of order packets. Meaning the packets arrive in a different order then they're sent. These packets were originally dropped and now it appears as though they're reordering them inside of a buffer, assuming this also means that the buffer still can only hold so many packets before it will once again dump the packets if they arrive too late. https://www.reddit.com/r/FortNiteBR/comments/awagpo/packet_reordering_technical_post/ Essentially this is packet loss, even though the game does not alert the user of the issue (packet loss indicator) and there is no way to diagnose this problem as of right now. Packet loss or extensive out of order packets would result in degraded simulation accuracy and make it very difficult for people to predict where people are going, register shots, and otherwise participate in a real time fashion. This doesn't just effect Fortnite, it effects all games and how extensive depends on the engine and the netcode. I did not know this was a huge issue, but apparently it is. Currently there does not seem to be any sort of ways of diagnosing this. I assume this isn't just the game, rather your connection, so ideally you could test this outside of a game setting. I also assume this would effect something like VOIP calls. Too big of a buffer and it introduces input delay which desyncs the conversation, too little and essentially you get packet loss and a garbled conversation. There are tools for jitter, bufferbloat, latency, and bandwidth. Is there one for testing the severity of reordered packets or practical packet loss? IE depending on the size of the buffer it counts late packets as packet loss. As mentioned earlier I believe this wouldn't just be applicable to helping diagnose problems with games, but also VOIP. [link] [comments]  |
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