On 2025-07-16 15:38, Chris Adams wrote:
Once upon a time, Frank Bures <buresf@xxxxxxxxx> said:
mtr --tcp -P 587 -4 smtp.gmail.com
works OK.
mtr --tcp -P 587 -6 smtp.gmail.com
returns:
mtr: udp socket connect failed: Network is unreachable
So you've flipped from v4 not working to v6 not working? Do you have
working IPv6 for other services? Are you forcing sendmail to use IPv6
for this, or just letting it use what works?
This sounds like either a local network issue or possibly a problem with
your service provider.
The situation now:
mtr --tcp -P 587 -4 smtp.gmail.com
is OK.
mtr --tcp -P 587 -6 smtp.gmail.com
returns:
mtr: udp socket connect failed: Network is unreachable
mtr --tcp -P 587 smtp.gmail.com (no IPv specified)
is OK.
ip -6 route
does not have "default" entry.
ip -6 neigh
returns all entries "STALE", no "REACHABLE".
I tried to add the default route to the IPv6 with
ip -6 route add default via fe80::xxxx:xxxx:xxxx:xxxx dev enp42s0
where fe80::xxxx:xxxx.... was the actual router address.
After that there was change:
1.
mtr --tcp -P 587 -6 smtp.gmail.com
returned
1. No route to host (instead of Network unreachable)
and
2.
My QEMU/KVM Win11 machine's networking went completely haywire and I had to
reboot the whole thing to get it back.
So what now?
Thanks
Frank
--
<listfrank1@xxxxxxxxx>
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