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Questions tagged [bgp]

BGP (Border Gateway Protocol) is one of the core routing protocols of the internet.

BGP (Border Gateway Protocol) is a protocol for exchanging routing information between gateway hosts (each with its own router) in a network of autonomous systems.

BGP is known as a path-vector protocol, the routing table contains a list of known routers, the addresses they can reach, and a cost metric associated with the path to each router so that the best available route is chosen.

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BGP advertising routes accross connected virtual networks

I have 2 vnets (same subscription), one in AU (10.2.0.0/18) and one in UK (10.2.64.0/18). The vnets are connected together and virtual PCs connected to each vnet can ping each other. Click here for topology My AU vnet is also connected to my…
EvilSibling
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BGP advertising prefixes

I've a basic question regarding BGP. How does a public AS's verifying networks that are being advertised to INTERNET? For example I have /25 assigned from RIR and how is this prefix verified by other routers that it really belongs to me ? And what…
pawel
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pfSense BGP and NAP

We have an AS number for a C class (/24) and 2 providers. Currently I have a Fortigate and a pfSense in the network. Fortigate is doing the BGP, and pfSense is doing the NAT, DMZ, VPN, VLAN. We are using 1 IP to route all internal traffic, 1:1 NAT…
Alin
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Dumping route changes from openbgpd

I have an openbgpd installation running on FreeBSD. I want to capture the routes whenever there is a change. Is there any way of getting this from the logs, or writing a hook to listen for such events?
talonx
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Bandwidth consideration of using AWS hardware VPN or Direct Connect?

I understand that aws hardware vpn has bandwidth limit of 4Gbps from https://aws.amazon.com/directconnect/ 'You can also use AWS Direct Connect instead of establishing a VPN connection over the Internet to your Amazon VPC, avoiding the need to…
chen
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How can I make two routers to speak to each other when they both belong to two different subnet and AS?

Here is my situation, I have a router R1 whose external IP address is 11.11.2.1. I have another router R2 whose external IP address is 5.5.2.1. I am running eBGP on R1 and R2. However, I cannot ping R2 from R1 and R1 from R2. How can I make them to…
dexterous
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Find IP address of router that is BGP announcing prefixes?

I am trying to determine if it is possible to find the IP addresses of all routers BGP announcing an IP prefix. For example, say 123.123.123.0/24 is being announced on three networks for the purpose of anycast. Is it possible to determine all three…
Ron F
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BIRD BGP Advertise Network with different gateway

I'm looking to use BIRD or similar to advertise a route from a linux box sitting on 169.254.0.3 (on a /28 for eg) to the router at 169.254.0.1 (Which happens to be AWS). The route advertised to AWS needs to be the following; AWS Subnet (10.0.0.0/24)…
Alex Turner
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Migrating from Static Routes to BGP:: now TRACERT/PING works but Windows CIFS or HTTP do not

When we switch from a static routed private non-BGP circuit to a BGP private circuit linking two offices, Windows shares and HTTP browsing of internal machines across offices fails with timeouts. Neither of these circuits goes across the public…
Gerry Wisnoski
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Vyatta (Brocade) receives BGP routes, but doesn't show in routing table

What would be the reason for Brocade vRouter to receive BGP routes, identify them as valid and best, but not use in the routing table? *show ip bgp neighbors 169.254.5.1 received-routes > 10.2.0.0/16 169.254.5.1 0…
Anton
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BGP ASN Peer information sources

So I know of the RIB files from RouteViews which can viewed using BGPDump. Now this data set will be easily able to show me the AS trace paths meaning I can find the upstreams for each ASN and their relative announced prefixes. My question is: how…
Yif Swery
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How to deploy public IP resource on local network

I would like to know how to get traffic for our public IPs routed to the ISP device (actually, the L2 switch connected to the ISP device). My organisation was just assigned a public IP range by our RIR. Our physical network layout is: ISP device -->…
Kheldar Ambar
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High latency when enabling secondary BGP server for same networks?

I have two BGP servers on OpenBSD using bgpd that are located in the same DC; I tried to enable multihoming for the same networks on both of the servers, but upon doing so all hosts in that DC started experiencing high latencies; this lasted for…
user101130
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How to connect Network and GRE Tunnel Traffic and control and flow of TCP/UDP Packets?

I need some serious help with a complex routing setup I am doing. Lets I have a /24 IPv4 .I am announcing the same /24 at two different locations. One is a ISP exchange center where all the ISPs peer each other locally.To make it simple just…
Rishabh Agnihotri
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Third party failover load balancing

Are there any third-party companies that provide a single IP address which is load-balanced over two IP addresses owned by the end customer? We are based in the UK. I need to provide a solution to my customers where they can have geographically…
Garry Harthill
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