On Sat, 25 Mar 2017 12:36:04 +0100 Alarig Le Lay wrote: > Hi, > > On one of my machines, I have two public IPv6 from two different > providers (one natively, another by VPN). I use ip -6 rule to make both > pingable. > > I see some strange things on the native one. It stops responding from > time to time. Here are some examples of mtr: > https://paste.swordarmor.fr/raw/mXVT > > At this time, the other IPv6 (bulbizarre.swordarmor.fr) works normally. > > And if I do the same test on another machine in the same LAN, no loss: > https://paste.swordarmor.fr/raw/XGbK > > I have this routing table: > alarig@bulbizarre ~ $ ip -6 rule list > 0: from all lookup local > 31010: from 2a01:cb08:898c:fc00:9913:b7a:b9bf:d30c lookup 3215 > 31100: from all lookup 51083 > 32766: from all lookup main > alarig@bulbizarre ~ $ ip -6 route show > 2a00:5881:4008:400::/64 dev tun0 proto kernel metric 256 pref medium > 2a01:cb08:898c:fc00::/64 dev eth0 proto kernel metric 4 pref medium > fe80::/64 dev eth0 proto kernel metric 256 pref medium > fe80::/64 dev tun0 proto kernel metric 256 pref medium > fe80::/64 dev tun-mysql proto kernel metric 256 pref medium > default via fe80::20d:b9ff:fe3a:1fa1 dev eth0 metric 4 pref medium > alarig@bulbizarre ~ $ ip -6 route show table 3215 > 2a01:cb08:898c:fc00::/64 dev eth0 metric 1024 pref medium > default via fe80::20d:b9ff:fe3a:1fa1 dev eth0 metric 1024 pref medium > alarig@bulbizarre ~ $ ip -6 route show table 51083 > default dev tun0 metric 1024 pref medium > > I’m using the kernel 4.9.16-gentoo. > > I’m running out of ideas, so I ask for your help :)
Run tcpdump -w on both sides. Compare dumps when connection stalls and when it works fine. Many reasons are possible, it's hard to guess from data you provided. But it makes me wonder why you have default via VPN and given address via eth0. This may lead to undesirable consequences like VPN carrier (or some aux request) trying to go through its own VPN tunnel. Best regards, Andrew Savchenko
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