nanog mailing list archives
Re: Issues with prefix / help needed
From: William Herrin <bill () herrin us>
Date: Sat, 25 Mar 2023 03:05:25 -0700
On Sat, Mar 25, 2023 at 1:54 AM ic <lists () benappy com> wrote:
Do you all have any idea what I should check / try next?
A good tool for diagnosing BGP problems is: https://www.routeviews.org/routeviews/ While the problem is occurring, pick some of the collector hosts from https://www.routeviews.org/routeviews/index.php/collectors/ and telnet to them. This will drop you into a Cisco-like CLI where you can "show ip bgp 86.104.228.0" and find out what the BGP path to your network is from a bunch of points around the world. This should help you identify the fault if the echo-request from 86.104.228.1 reaches the remote host but the echo reply from the remote host doesn't make it back to 86.104.228.1.
When I ping one of the IPs from various ISPs, I see the ICMP Echo Request and Reply on the wire, going where it’s supposed to go, but it doesn’t reach the pinging host.
The echo-request reaches your host at 86.104.228.1 but the echo-reply doesn't reach the pinging host? That sounds more like a packet filtering problem than a BGP problem. Try doing a traceroute to the remote pinging host from two sources: 86.104.228.1 and one of your ISP's IP addresses (get them to assign you one if you don't have one). The difference between the two may give you an idea where the filtering error is. Regards, Bill Herrin -- For hire. https://bill.herrin.us/resume/
Current thread:
- Issues with prefix / help needed ic (Mar 25)
- Re: Issues with prefix / help needed ic (Mar 25)
- Re: Issues with prefix / help needed William Herrin (Mar 25)
- Re: Issues with prefix / help needed Aaron Gould (Mar 25)
- Re: Issues with prefix / help needed ic (Mar 25)
- RE: Issues with prefix / help needed Kevin McCormick (Mar 27)
- Re: Issues with prefix / help needed Charles Monson (Mar 27)
- Re: Issues with prefix / help needed Niels Bakker (Mar 27)
- Re: Issues with prefix / help needed ic (Mar 28)
- Re: Issues with prefix / help needed Charles Monson (Mar 27)