We have started facing this issue recently where our Public IP Address with AT&T cannot be accessed by anyone especially for people using Comcast Internet.
We have two core routers with iBGP configured, please refer below topology:
So the issue is only with the IP Address we use that is owned by AT&T(Router1). These IP Addresses are only routable via AT&T. We do not advertise this on BGP. Lets take 184.108.40.206 as AT&T Owned IP.
This IP Address is not reachable via any Routes that has the best path via Comcast(Router2). When someone from Comcast internet access this site, we see the traffic coming inside, but when the reply goes, it will go to AT&T Router1 and from there it is send to the Comcast Router2. Making it no routable to the end user.
Is there anyway that we can get this fixed without killing the BGP loadbalancing?
Im not sure if Im understanding the question properly, but please correct me, Have you verified the metrics on Router 1 why the packets are taking the path Router 1 -- > Router 2 --- > End User instead go directly throug AT&T path?
Probably AT&T has a restriction on their peer. You could provide a show ip bgp <ip address> on Router 1?
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.