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

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Sizing Firewall for Micro-Datacenter

We have a small data center we're finishing. We have a core+spline and then redundant TOR switches. Everything is basically whitebox 10gb switches running Cumulus; although, we will upgrade the core ...
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26 views

Traceroute and BGP peering

Doing a traceroute for example: 1: 1ms 1ms 1ms 1.1.1.1 2: 2ms 2ms 2ms 2.2.2.2 3: 5ms 5ms 5ms 3.3.3.3 4: 9ms 9ms 9ms 4.4.4.4 My question is: If the AS number of 2.2.2.2 and 3.3.3.3 are not ...
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59 views

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 ...
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1answer
55 views

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 ...
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67 views

ping between ipv6 and ipv4 networks

I have 2 networks (one ipv4 and one ipv6) , I used ospf as routing protocol for both networks. I activate bgp between this 2 networks(R6 and R1) and now R6 can ping the full ipv6 network and R1 can ...
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50 views

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. ...
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3answers
107 views

How does a router on the Internet know where to send a packet to next to get it towards its destination IP address? [closed]

I've been doing small-time freelance IT work (among other things) for about the last decade now. I've set-up or rebuilt more local network arrangements than I can care to count, and more recently I've ...
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67 views

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 ...
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297 views

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: ...
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35 views

BGP redistribute connected

I used the quagga package to learn BGP in my test Network. So i used the command redistribute connected that sends the Router UPDATE message as expected with all the links. However my task is to ...
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67 views

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 ...
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56 views

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 ...
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1answer
74 views

Update Cisco 3750 for BGP

I have a Cisco 3750 switch that I use at my data center w/ a failover switch as well. Currently getting a blended bandwidth from the data center instead of BGP. From time to time I'll have them update ...
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40 views

using OSPF over PE-CE Links in VPNs

area0 area0 CE1----------PE1-----------PE2-------------CE2 N1 N2 CE1,CE2 are same customer edge routers. PE1,PE2 are provider Edge routers of ...
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38 views

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 ...
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1answer
248 views

How do I enforce preferential routes with BGP & Quagga?

I have two routers that I'm setting up currently and they will be feeding my network of servers with a private AS number provided by the datacentre. What I want to do is provide both a VRRP failover ...
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179 views

Solving an asymetric HA Firewall/router

I have an old Linux HA firewall/router setup that never quite worked. As it was never quite put into true production (just testing and demo's), I always had to have one firewall shutdown to make it ...
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1k views

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 ...
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1answer
155 views

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 ...
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387 views

Routing Issue - can't ping gateway from other routers in full mesh

I am setting up a new network. I have 4 routers in a full mesh. Edge1, Edge2, Client1, Client2. This are Mikrotik Cloud Core Routers (not that it matters). They are set up with OSPF (distributing ...
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158 views

Filter OSPF routes redistributed by BGP

I am redistributing OSPF routes inside a network, through BGP. However I don't want to redistribute all the advertised routes from OSPF (specificaly the private networks) to the outside of the AS. How ...
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303 views

HP 5820 Switch in BGP routing

I planning to build an isp network with 2 redundant BGP routers. After a bit of research I found strange that even switches can do BGP, at least that's what it says in their manual. Considering how ...
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580 views

BIRD iBGP - Route not reachable

i have two machines participating in the DN42 network, a darknet driven by the Chaos Computer Club and others to play around with advanced routing techniques like BGP and stuff. The machines are ...
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1k views

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 ...
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402 views

BGP into OSPF and vice-versa - adding a 'weight' to a route?

This is probably more of a design question. I have two transit providers where I am receiving the full Internet routing table (via BGP) and am also participating in an IX where I am receiving routes ...
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201 views

Redundant Debian Gateway

I have to configure a redundant gateway with Debian boxes and I would like to get some recommendation what's the best solution in my case. There are certain limitations in my setup and I have to go ...
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117 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 ...
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49 views

Use of loopback Interface in iBGP

As I understand that the loopback interface(127.0.0.1) is used to route packets back to the source. How is it then used to talk to iBGP neighbors? I understand that the goal is to ensure that the ...
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2answers
356 views

Benefits of peering with Transit Providers at exchange points

Whilst investigating choices of IXPs and browsing through member lists, I realised that Hurricane Electric publicly peered on AMS-IX and other popular IXs. I also came across their peering policy that ...
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26 views

Is it possible to run IPv6 only BGP sessions?

We wish to peer with some members of an IXP that all support IPv6 peering. We do not wish to publicly peer on the IXP. Is it possible to save ourselves the trouble of getting a /24 block of v4's and ...
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443 views

Where do local ISPs' core networks connect to? [closed]

Where do local ISPs' core networks connect to? Do they connect to the Internet Backbone owned by AT&T and Sprint (among others) or do they connect to an IXP (Internet eXchange Point)?
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3k views

Simple Vyatta configuration / BGP routes not injecting into routing table

I have a exceptionally simple setup I'm playing with however I'm banging my head against the wall as to why it's not working. Right now I have two Vyatta routers (R1, R2) connected locally. Both are ...
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145 views

bgp and incomming requests

I have IP pool, 2 providers and BGP on RouterBoard. First provider is default. Second is backup. If first provider falls - outgoing connections works on second. But incoming still routed to broken ...
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218 views

Why an anycast server is so far away / slow? How does BGP anycast work?

I've tried doing a couple of traceroute tests to the DNS servers of Rage4, which are anycasted from many parts of the world (supposedly, from 30 different locations). What I've experienced is that ...
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1answer
2k 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 ...
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2answers
308 views

Understanding traceroute-result / the connections between ISP-networks

I was playing with traceroute and discovered that I have a gap in my knowledge on how the Internet works. So, in order to get a better feeling for what happens when I connect to a host, I think I ...
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2k views

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 ...
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55 views

Cisco - redistribute prefix [closed]

I had 2 C class IP's: xx.xx.xx.0/23. I must advertise it on BGP protocol. My config is: ip route xx.xx.xx.0 255.255.254.0 Null0 ! access-list 50 permit xx.xx.xx.0 0.0.1.255 ! route-map ...
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659 views

JunOS Regular Expressions for AS Path

I want to write a regex in Juniper MX960 router for BGP including 3 AS paths with first element is constant, second and third are wildcard. I found that we can put as numbers manually like this: ...
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1answer
118 views

Cisco 7200 VXR - BGP Cache Corruption?

We are running an old Cisco 7200 VXR router as our border router and lately have had issues with sites failing to resolve. A manual BGP reset on this router resolves all of our problems. I'm fearing ...
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547 views

BGP can I specify using the backup link for some network

assuming I connect to two diff ISP and set them up as redundant connections, one with heavier weight than the other. Is it possible for me to say, any route to some guy in Spain should use the slower ...
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2k views

Juniper EX BGP with Default Routes

I'm new to BGP - so this is certainly a learning exercise. I'm moving away from PA space provided on 2 routed uplinks to having my own IP space and multi-homing my transit. To begin with, there will ...
3
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1answer
2k views

Dual Cisco Router Stateful Firewall

At my company we have a single Cisco 3925sec/k9 router running BGP with 2 ISPs. Now we want to purchase a redundant router of the same model to eliminate a single point of failure. I can set up BGP ...
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3answers
2k views

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 ...
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1answer
386 views

How can I multipath BGP prefixes of equal AS-path length?

Say I have two routes of 10.0.0.0/8. One has an AS-path of 100 200 300, the other has 400 500 300. How can I make BGP install both routes into the FIB on a Cisco router?
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664 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, ...
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298 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 ...
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91 views

BGP Dual-As support, any RFC?

Generally most of routers like cisco and junos allow a router to have dual-As to be configured via a "local-as" command which overrides the global as-number configured in "router bgp ". Also local-as ...
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1answer
91 views

BGPmon login: 'Password: incorrect access password'

I have installed BGPmon following the manual. When I try to login by typing the address "http://127.0.0.1:50000/" on address bar, It shows "Password: incorrect access password" message. thank you
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584 views

Nagios check_bgp_neighbors plugin showing critical status

I am trying to configure nagios check_bgp_neighbors plug-in on Ubuntu and followed README file of check_bgp_neighbors plug-in. I have made following changes: define command{ command_name ...