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Questions tagged [bgp]

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

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Juniper SRX300 Maximum BGP routes

I've got a Juniper SRX300 which i'm using to connect to 2 BGP peers. The documentation i've read says this SRX only supports 300,000 BGP routes, so for each peer I created an import policy (based on ...
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19 views

Scaling VXLAN overlay without too many tunnels

I'm trying to setup a simple but scalable overlay network sing VXLAN tunnels but having too many VTEPs leads to many many tunnels and I don't know how that can be a good idea. I asked a question ...
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1answer
55 views

IP Transit Using GCP compute instance?

If I announce my IP space on GCP compute engine and connect to GCP via a Dedicated interconnect, as the inbound transfer on GCP is free, can I use GCP as my inbound IP Transit
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14 views

There have the route in router, but I can not ping it

the network is 142.0.143.0/24, I can not from my Router to ping it. and I found there is a route of 142.0.0.0/20 which AS path is 1299 13576 I, I can not found the more detail network such as 142.0....
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51 views

Quagga BGP - How do I remove a blackhole from Quagga BGP configuration

In the above screenshot you can see that the preferred route for 10.120.15.0/24 is into a 0.0.0.0 black hole. First, how do I remove that black hole from vtysh Second how do I add a new IP in there ...
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1answer
89 views

Share AWS DirectConnect between multiple accounts

AWS allows you to share your DirectConnect connection amongst multiple AWS accounts via a hosted virtual interface (instructions here). I have a pfSense device on the local side of an MPLS line for ...
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1answer
45 views

how can I know since when has a BGP prefix been allocated?

I am a bit confused. I would like to know since when a current ASN (and its corresponding prefixes) have been in place. When I look at the example at team-cymru (http://www.team-cymru.com/IP-ASN-...
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1answer
32 views

can I still map an IP address to its ASN number when the last octet is masked?

I have a database of IP addresses whose last octet has been masked IpAnonymizer.mask_ip("8.8.4.4") # => "8.8.4.0" Can I still use map these IPs to their respective Autonomous Numbers or the ...
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122 views

NGINX: Map IP to ASN

in Preparation for GDPR I want my NGINX to not log IP's any longer, but log the AS Number. To map the ip to an AS number, I would use the BGP datasets from Ripe, and import them in an MySQL table. ...
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2answers
48 views

Synchronize states of bridge interfaces

We have redundant 10G fiber links to our upstream internet provider in an active/failover configuration. Between our router and the upstream router, we have a pair of firewalls running Vyos in ...
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1answer
338 views

EdgeOS BGP routes received but not being injected

I'm trying to set up BGP over IPSEC with Google Cloud Platform. The IPSEC tunnel is successfully established, and GCP reports the BGP session as up. EdgeMax router is receiving the routes, but isn't ...
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31 views

Can the RPK infrastructure sign a SSL certificate for an IP? Will browsers recognize it?

In theory every AS, ISP provider or whatever, holds a certificate proving that it owns the range of addresses assigned to him. This is the Resource Public Key Infrastructure (RPKI) and it seems well ...
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1answer
305 views

VPN to Shared VPC in GCP incorrect BGP routes being chosen as best

We have route based VPN tunnels going from a pair of Cisco routers at each of two sites (4 total routers), to two different VPN Gateways in the same shared VPC (XPN). Sharing routes through BGP, to a ...
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1answer
57 views

Cisco - BGP Best Path Algorithm - Which criteria

I set up below topology on Cisco IOU environment. R1, R2 and R3 routers are configured with one loopback interface on each, having "1.1.1.1", "2.2.2.2" and "3.3.3.3" addresses respectively. These ...
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1answer
36 views

How to create a group of servers listening on the same IP-address, allowing failover/takeover? [closed]

I'd like to deploy a web application in a robust manner. The application itself is written using Elixir, which runs on top of Erlang/OTP, meaning that the application can be deployed on different ...
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1answer
194 views

bind address of application on multihomed server

I have a multi-homed server running bgp via quagga If I fire up an application on this server that initiates a connection, by default it is going to choose the interface with the lowest metric, ie ...
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120 views

configuring MD5 bgp authentication on solaris 11 using quagga

I am attempting to configure a BGP router within a solaris zone, using dedicated network interfaces. Upstream provider insists on the use of MD5 authentication. I have no bgp sessions coming up. I ...
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1answer
135 views

BGP interaction with IGP

I know that there are substantially two ways in which BGP and IGP can interact: 1) Distribution of default 0/0 route into IGP (for example OSPF, IS-IS, RIP,..) 2) Injection of BGP-learned route into ...
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3answers
896 views

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 ...
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1answer
103 views

Separating networks on 2 bgps from 2 ISP

I have Cisco router with 2 bgp's sessions from 2 isp's and want to separate my networks for example 80.80.80.0/24 to go trough first ISP and 90.90.90.0/24 to go trough the second ISP, but to have the ...
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1answer
627 views

pfSense to Amazon VPC IPsec VPN Tunnel Fails to Connect

I'm trying to setup an IPsec VPN tunnel with BGP routing from a pfSense 2.3.2 firewall to a recently created AWS VPC.I've installed OpenBGPD on the pfSense firewall. I've followed this tutorial: ...
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1answer
321 views

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 ...
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1answer
713 views

How to connect to a BGP network? [closed]

A service provider we're working with delivers us data via two(for resiliency) 1Gbps cross connects. He's located in a datacenter nearby the datacenter where our server is located. We don't have a ...
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1answer
78 views

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 ...
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1answer
745 views

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 ...
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1answer
82 views

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?...
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2answers
4k views

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 ...
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3answers
976 views

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 ...
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1answer
1k views

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 ...
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1answer
308 views

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 ...
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0answers
833 views

How can one update BGP ASN on an Azure Virtual Network Gateway?

I have an existing Azure Virtual Network Gateway I'm attempting to reconfigure for use for BGP, per https://azure.microsoft.com/en-us/documentation/articles/vpn-gateway-bgp-resource-manager-ps/ . ...
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0answers
58 views

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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1answer
191 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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1answer
245 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
575 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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0answers
362 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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0answers
90 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
224 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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0answers
359 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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1answer
859 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: https:...
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1answer
374 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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1answer
660 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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1answer
74 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
428 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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1answer
102 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 ...
3
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1answer
2k 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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0answers
633 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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2answers
8k 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
332 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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0answers
854 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 ...