Hello Honghao,

Thank you a lot, just set net.ipv6.route.max_size = 1073741824, will look at it now.

--

--------------- Original Message ---------------
From: Honghao Zeng <nat@nat.moe> [nat@nat.moe]
Sent: Mon, 22 Mar 2021 16:49:20 -0400
To: jared@jared.kiev.ua
Subject: Re: CentOS to Debian migration issue

We had a similar issue when we migrated to debain a while back; flapping sessions, weird timeouts, etc. Tweaking `net.ipv6.route.max_size' helped. Some clues:

- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=861115#10
- https://bird.network.cz/pipermail/bird-users/2020-February/014270.html

Regards,
Honghao Zeng