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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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How are IP addresses actually assigned?

I'm having a hard time understanding how a governing body assigns IP addresses, companies use BGP to advertise those IPs, and how the internet works. Then, where the hell does DNS come in? Can anyone suggest a good read of how this stuff actually…
Vegim
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What is the difference between BGP and OSPF?

I want to setup a dynamic routing network， I want to know, What is the difference between BGP and OSPF ? Does both two need to be used together commonly ?
larry
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If public IPs are pinned to a single AS, how does BGP anycast work?

It is my understanding that public IP blocks are assigned from IANA, which assigns sub-blocks to RIRs, which assigns sub-blocks to ISPs, which assigns sub-blocks to individual ASs as outlined in this question: How are IP addresses actually…
turtlemonvh
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Freebsd or Linux? as BGP router over 100mbps

I am building a server to act as a BGP border router for my 100mbps uplink in ISP. I needs these feature: 1) Dual stack BGP peering/routing (at least 100Mbps, maybe more). 2) Potential full internet BGP feed. 3) Some basic ACL functionality. The…
user74617
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Experiences with BIRD for BGP?

We're currently using Quagga with Debian Linux to run a full table BGP router. The set-up has been dead simple up to now, but we've come to a point where I have to reconfigure the router quite a bit, and want to tighten things up. I've never really…
Shtééf
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What happens in the real world Internet - BGP and OSPF?

I have never worked on the customer premises, but my assumption is that one service provider runs IGP services internally - For example - OSPF or IS-IS. Now, when one service provider has to reach another service provider to communicate server on…
dexterous
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Cisco BGP Unequal Cost Load Balancing

I'm trying to implement BGP Unequal Cost Load Balancing feature in my network. According to cisco manuals (long: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fsbgplb.html, short:…
Shamanu4
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Global high availability setup question

I own and operate visualwebsiteoptimizer.com/. The app provides a code snippet which my customers insert in their websites to track certain metrics. Since the code snippet is external JavaScript (at the top of site code), before showing a customer…
Paras Chopra
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Choosing Transit Providers

My organisation is in a position where we are paying quite excessive charges for single homed IP transit form our primary data centre provider. We're at the position now where we're ready to start thinking about switching to direct relationships…
SimonJGreen
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Loadbalancing outbound traffic while using openbgpd on freebsd

I am using openbgpd in freeBSD with 2 ISP connections. I have my own AS number and a /22 network. Currently I am advertising entire /22 to both networks. Inbound traffic comes in But my outbound traffic goes via a single link. I would like to either…
Rajkumar S
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BGP Multi-Homed Cisco Routers Configure For Resilience But Separate Inbound Weight

I've got 2 Cisco routers, each with a single Internet feed, providing BGP with default route only, which allows us to advertise certain routes out each feed. We're not using the full DFZ because although we usually run all Cisco 3925s, we currently…
furriephillips
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Linux "traceroute -A" (AS path lookup) equivalent for Win XP?

Can anyone recommend a Win XP command-line traceroute implementation providing a function equivalent to the Linux "traceroute -A" option, which includes in its output the BGP AS number (Autonomous System) for each hop traversed ? Thanks
user177934
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How to prevent asymmetric routing with multiple eBGP routers?

I have 2 routers announcing a /22 subnet to different providers (one providers connects to each of the 2 routers). I have split the /22 in two /23 to announce one /23 on each of the routers plus the /22 (the providers will take the more specific…
Andy Shinn
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Need to find users of ASN in my country

Anyone knows where I can get list of Autonomous system number users by country ? If it is not possible to get it by country, any kind of list will suffice. thnx
Nevenka
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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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