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problem with network adapter: works partially
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laizzn
n00b
n00b


Joined: 24 Feb 2015
Posts: 24

PostPosted: Wed Jul 04, 2018 9:43 am    Post subject: problem with network adapter: works partially Reply with quote

Hi,
Since about a couple weeks ago the network adapter is behaving weird.

After rebooting my network adapter only works partially. When I try to ssh/ping to the affected host, sshd does not send a response and 2/3 of icmp packets are lost:
Code:

try#1:
....
debug1: Authenticating to host:22 as '<user>'
debug1: SSH2_MSG_KEXINIT sent
Connection closed by <ip> port 22

try#2:
...
debug1: Authenticating to host:22 as '<user>'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by <ip> port 22

PING host.local (<ip>) 56(84) bytes of data.
64 bytes from ost.local (<ip>): icmp_seq=3 ttl=64 time=2.21 ms

--- host.local ping statistics ---
3 packets transmitted, 1 received, 66.6667% packet loss, time 2076ms


I experienced this issue two times so far (reboot after kernel upgrade) and I can "fix" it by rebooting again..(2x today).
I don't know if it is because of my new router or maybe an intel microcode update...?!

What can be the problem?
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krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6968

PostPosted: Wed Jul 04, 2018 11:41 am    Post subject: Reply with quote

Quote:
because of my new router

your symptoms and that quote make it a good candidate for mtu trouble.
so that would be first thing i would check myself.
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