nanog mailing list archives
Re: interesting troubleshooting
From: Christopher Morrow <morrowc.lists () gmail com>
Date: Sat, 21 Mar 2020 13:42:44 -0400
(skipping up the thread some) On Fri, Mar 20, 2020 at 5:58 PM Jared Mauch <jared () puck nether net> wrote:
It’s the protocol 50 IPSEC VPNs. They are very sensitive to path changes and reordering as well. If you’re tunneling more than 5 or 10Gb/s of IPSEC it’s likely going to be a bad day when you find a low speed link in the middle. Generally providers with these types of flows have both sides on the same network vs going off-net as they’re not stable on peering links that might change paths.
a bunch of times the advice given to folk in this situation is: "Add more entropy", which really for ipsec/gre/etc vpns means more endpoints. For instance, adding 3 more ips on either side for tunnel egress/ingress will make the flows (ideally) smaller and more probable to hash across different links in the intermediary network(s). This also moves the loadbalancing back behind the customer prem so ideally perhaps even the nxM flows are now balanced a little better as well. sometimes this works, sometimes it's hard to accomplish :(
Current thread:
- interesting troubleshooting Nimrod Levy (Mar 20)
- Re: interesting troubleshooting Job Snijders (Mar 20)
- Re: interesting troubleshooting Jared Mauch (Mar 20)
- Re: interesting troubleshooting Job Snijders (Mar 20)
- Re: interesting troubleshooting Christopher Morrow (Mar 21)
- Re: interesting troubleshooting Brandon Martin (Mar 24)
- Re: interesting troubleshooting William Herrin (Mar 20)
- Re: interesting troubleshooting Jared Mauch (Mar 20)
- Re: interesting troubleshooting Saku Ytti (Mar 20)
- Re: interesting troubleshooting Matthew Petach (Mar 20)
- Re: interesting troubleshooting Saku Ytti (Mar 21)
- Re: interesting troubleshooting Matthew Petach (Mar 22)
- Re: interesting troubleshooting Matthew Petach (Mar 20)
- Re: interesting troubleshooting Job Snijders (Mar 20)
- Re: interesting troubleshooting Chris Adams (Mar 20)
- Re: interesting troubleshooting Steve Meuse (Mar 20)
- Re: interesting troubleshooting Saku Ytti (Mar 21)
- Re: interesting troubleshooting Mark Tinka (Mar 21)
- Re: interesting troubleshooting Saku Ytti (Mar 21)