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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.

Resources

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Amazon CloudFront and EC2: Global Load Balancing

We have an app that is going to store and serve up a decent amount of data in S3 to a global audience where latency should be minimized. So, we've been doing tests with Amazon CloudFront and have seen favorable results. However, we need a thin…
Matt Rogish
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Best way to improve resilience?

One of the major projects I have lined up for 2010 is attempting to mitigate some of the Single Point of Failures (SPOFs) in a network I currently manage. We currently have a single datacentre rack containing a couple of dozen servers. Inside the…
Tom O'Connor
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Overcome asymmetric routing while migrating between sets of ISPs

We are migrating from one set of addresses to another set, both /24, and trying to minimize any down time during the migration. Ideally we'd run both for a period of time as we shut down the old circuits. There are a total of 4 internet…
fullstop
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Monitor BGP connections

Do you know any special software for monitoring BGP peers, prefixes, log their failures, prefixes amount and etc? (Cisco) ( Not zabbix, nagios and etc, i know that you can write plugins or work with snmp, but I am searching for already written…
TiFFolk
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How to find which routing protocol a router is using. And if found how to test it

I was recently asked a networking question in an interview which I did answer but the interviewer was not pleased. The question was : "Given an actively running router, how would you know what routing protocol is the router using, specifically how…
pradaa
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Practical Anycast

I've read How can I send visitors to the closest server using DNS? post, but there's still some thing, on a practical level that I don't understand. Say I have two servers. One in NY another in Paris. Both of them have different IP adresses 1.1.1.1,…
Daniel
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Making hosted applications resilient to BGP failures

My company builds various web sites for its customers with a dedicated hosting provider. This hosting provider accidentally shutdown the devices responsible for Border Gateway Protocol (BGP) announcements for a small range of IPs. Since I'm lucky…
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Quagga vs XORP vs BIRD - linux BGP router recommendation

For a small multihomed network (/21) I am researching possible bgp router software for linux. I found Quagga, XORP and BIRD and was wondering if I have missed other recommendable bgp software for linux anyone could speak in favour of or against…
Isaac
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Simple Quagga BGP router

We are attempting to setup a Gentoo Linux box to run a Quagga BGP router for our internet connection. We've tried many things, but everything we've tried results in Quagga reporting that there is no BGP network available and it never connects to the…
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DNS Round-robin failover and load balancing

Having read all of the questions and answers (1 2 3 and so on) on here relating to DNS load balancing, and Round-robin DNS, there's still a number of unanswered questions.. Large companies, and I'm looking at Google, Facebook and Twitter here, do…
Tom O'Connor
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Transparent proxy cache on BGP multihome

Provider A have transparent caching with squid . In the situation which a client has multihome BGP with provider A and provider B then client does not send its outgoing traffic (upload) to provider A but its incoming traffic (download) comes…
Omid Kosari
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BGP path prepended route not listed anywhere

We have a simple multi-homed setup with two routers that advertise our AS to two ISP. The second ISP (ISP B) is only used for backup when ISP A goes down, so we prepended our AS 3 times on this route. Note: These are example ASN, not the real…
Julien Vehent
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Can DDoS be stopped with BGP?

When I am experiencing DDoS @10Gbps, if I have BGP router with 10M table entries in it, can I perform search on the offensive network? I would do this the way, that first I would remove routing to me for first /8 and see if DDoS will stop. And then…
Andrew Smith
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How to prevent default route from propagating into iBGP?

I have 2 Foundry FESX448 switches which have external BGP connections. Each of them receive a default route. These 2 switches also have a BGP session configured between themselves and advertise routes to each other as iBGP. I only want one of the…
Andy Shinn
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Renting a IPv4 address block

I am building a lab network with about 10 virtual routers and 20 host machines (also virtualized) as a part of a school project. The aim is to demonstrate a wide range of IPv6 routing, deployment and transition mechanisms. However, there is a…
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