3
votes
2answers
31 views

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 ...
0
votes
0answers
21 views

What is stopping a random router to announce any subnet? [duplicate]

Besides contractual obligations, what is stopping a random router to announce, say 173.194.0.0/16?
1
vote
1answer
273 views

Internet Routing with BIRD

I am testing BIRD to put into production to replace several VPN appliances I am using to route to my AWS site. I've never used BIRD before so please forgive ignorance/ If I put a test windows ...
0
votes
2answers
275 views

BGP/ASN: Network without own backbone?

I'm trying to understand the principles of routing in the internet, especially regarding (E)BGP. So far, I understand the situation of a "typical" ISP (e.g. with the ASN 2) that has its own backbone, ...
0
votes
1answer
125 views

Redistribution of iBGP learned routes to all routers?

I am trying to accommodate for a link failure between LB1 (a Linux machine running Quagga) and either PAT1 or PAT2 (Juniper MX80 routers). The following diagram is a canonical version of my network ...
3
votes
1answer
426 views

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. ...
1
vote
0answers
111 views

Advertise iBGP learned routes to sub-AS confederation peer

I am having a difficult time figuring out one of the fundamental rules of iBGP, eBGP, and confederations. Consider the following routers which are all in the same Autonomous System (AS) r1 == r2 ...
1
vote
2answers
721 views

linux routing or natting with ip on loopback interface as alias

Ive got eth0:0 192.168.2.10 (for bgp network announce, no vlan, alias on eth0) eth0.1 192.168.3.20 (for bgp session 1,vlan3 transport to bgp router) eth0.2 192.168.4.30 (for bgp session 2,vlan4 ...
3
votes
3answers
3k views

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 ...
1
vote
1answer
200 views

High latency due to non-presence of a transit provider in my country

My ISP, a state owned incumbent, buys bandwidth from different transit providers. Whenever it buys transits it announces only a specific prefix (in most cases a hitherto unused) through the new ...
1
vote
1answer
151 views

Are ASNs tied to one location/router/physical point?

I am trying to understand how BGP works, and is looking at ways to identify if my ISP is having bottlenecks/slowdowns/dos attacks at thier upstream ISPS. I have a bunch of ASN numbers that I can ...
1
vote
3answers
617 views

What are the advantages of OSPF vs nexthop self with iBGP?

Assuming I have a fairly small network internally, but I have 4 routers each connected out to a different network. The routers are all sat next to each other connected via a switch. Each router uses ...
4
votes
1answer
248 views

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 ...
3
votes
3answers
452 views

2 BGP Upstreams, One sending default route, another Full Table

We have 2 upstreams ISP A and ISP B. ISP A (10Mb/s) is our main upstream with good bandwidth. It sends us default route over bgp. ISP B (2Mb/s) is our backup upstream with a small bandwidth, but it ...
0
votes
0answers
169 views

BGP network command route announcement

I have defined 3 AS (1000 <---> 2000 <---> 3000). Every AS has one router with 2 fa interfaces and one loopback. After starting bgp on all interfaces and announcing networks with commands: ...
3
votes
2answers
327 views

How any routing protocol packet reaches(flows of operations) from NIC card (physical layer) to any Routing (OSPF/RIP/BGP) daemon?

The problem is rearding the routing protocol packet flow in any linux/unix device where multiple routing protocol daemons are running. How any routing protocol packet reaches(flows of operations) ...
0
votes
2answers
1k views

BGP preferred outbound peer for given prefix when none of my peers directly announce the prefix (it's handled by the Default route)

I'm connected to 2 BGP peers; They both give me a filtered table that includes a default + about 30K prefixes each (not a full table). For prefixes that I do receive, I simply let BGP use it's ...
2
votes
2answers
257 views

What routing protocol to use with MPLS?

My MPLS provider is giving us a choice to use static routes or BGP for our new MPLS setup. What are advantages/disadvantages of the 2 choices? What is more commonly used?
3
votes
2answers
179 views

What happens if one BGP peer only gives me a default while the second peer gives me the full table

Summry question: If ISP A only gives a BGP Default and ISP B gives me the full table, can my router use the information it receives from ISB B to know what IP's are easier accessed through ISP A? ...
1
vote
1answer
575 views

Cisco BGP clustering and route reflection configuration example

I am trying to make sure that I have this correct in my own mind how the Cisco configuration would be given the following example of route reflection and clustering with BGP. If you have three AS 1, ...
2
votes
1answer
173 views

How to get ip prefixes from children of given as number?

So, for example I have as number as10282 how I can get ip prefixes of children for the given as number? bgp lookup tool Given tool is exactly what I need (with ticked include downstream prefixes), ...
1
vote
3answers
342 views

using bgp without owning ASN

Is it possible to use BGP to announce serving IP addresses without owning an AS number? Aim is to adding another WAN provider and increase redundancy with the ability to announce IP addreess from to ...
4
votes
3answers
471 views

Is Internet routing (BGP) fully automated?

If all the routing tables on the Internet would be erased simultaneously, will the routers be able to rediscover them automatically? I'm having an argument with a colleague who says that the RIPE ...
3
votes
5answers
23k views

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 ?
1
vote
1answer
256 views

Where can I get fresh routing registry data for IP:ASN and AS lookups?

I'm interested in maintaining a copy of the type of data available at ftp://ftp.arin.net/pub/rr/arin.db however the arin.db file seems to be missing quite a few resources which are available via the ...
4
votes
1answer
686 views

Quagga keeps announcing down routes

I have set up BGP on two routers using qugga. When I down the interface that holds the IP block that I am advertising zerba removes the route from its table but bgpd keeps advertising it. I can see ...
6
votes
3answers
2k views

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 ...
2
votes
2answers
1k views

BGP Multihomed/Multi-location best practice

We're in the process of designing a new iteration of our network where we improve resilliency by adding a second datacentre. We'll be adding a second datacentre, with an identical configuration of ...
1
vote
4answers
2k views

Influencing outbound routes on multi homed BGP setup

I have a multi-homed network setup. I'm using a Cisco 7200 to do BGP advertising to both provider A and B. For each provider, I have a separate /24 that I'm using. I am AS prepending to influence ...