Hi, On 22.06.23 08:36, RVP wrote:
Can you see any errors from sshd(8) in the logs on the DomU? If not, run the sshd server standalone like this: ``` /usr/sbin/sshd -Dddd -E/tmp/s.log ``` then post the `s.log' file after you run something like: ```$ ssh -E/tmp/c.log -vvv XXX.NET 'dd if=/dev/zero bs=1m count=10000 msgfmt=quiet' >/dev/null``` on the Dom0.
Thanks for all the good points and suggestions. I have picked up the last one and temporarely ran sshd on the DomU in debug mode, while repeating the exact same test with ssh and dump.
Here are the logs:- Dom0: https://paste.petermann-it.de/?0c56870be0c9e8b1#9bCJT4C2hTBMUWzgDu84o6ipccjC7kNQzdofQtCaLUyz
- DomU: https://paste.petermann-it.de/?8185479d13b60bbd#98azwgVmfsz5aQ8dPswwCD2yn2mTnM9kstVLvNv8JUKy
During this test, the error count on the affected interfaces did not increase further:
```
netbsd_netif_rx_bytes{interface="re0"} 64759716902
netbsd_netif_tx_bytes{interface="re0"} 1017162986389
netbsd_netif_errors{interface="re0"} 0
netbsd_netif_rx_bytes{interface="lo0"} 99500058
netbsd_netif_tx_bytes{interface="lo0"} 99500058
netbsd_netif_errors{interface="lo0"} 0
netbsd_netif_rx_bytes{interface="bridge0"} 1047528461564
netbsd_netif_tx_bytes{interface="bridge0"} 1049530231106
netbsd_netif_errors{interface="bridge0"} 0
netbsd_netif_rx_bytes{interface="xvif1i0"} 33842998
netbsd_netif_tx_bytes{interface="xvif1i0"} 31012168535
netbsd_netif_errors{interface="xvif1i0"} 26
```
The relevant part from the client log...
```
debug2: channel 0: window 1900544 sent adjust 196608
debug2: tcpwinsz: 197420 for connection: 3
debug2: channel 0: window 1966080 sent adjust 131072
debug2: tcpwinsz: 197420 for connection: 3
debug2: channel 0: window 1966080 sent adjust 131072
debug2: tcpwinsz: 197420 for connection: 3
debug2: channel 0: window 1966080 sent adjust 131072
debug3: send packet: type 1
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i0/0 o0/0 e[write]/0 fd 6/7/8 sock -1 cc -1
io 0x01/0x00)
Connection to srv-net closed by remote host. Transferred: sent 1086580, received 7869273016 bytes, in 393.9 seconds Bytes per second: sent 2758.8, received 19980159.5 debug1: Exit status -1 ``` ...and from the server log... ``` debug2: channel 0: rcvd adjust 131072 debug2: channel 0: rcvd adjust 131072 debug2: channel 0: rcvd adjust 196608 debug2: channel 0: rcvd adjust 131072 debug2: channel 0: rcvd adjust 131072 debug2: channel 0: rcvd adjust 131072process_output: ssh_packet_write_poll: Connection from user user 192.168.2.50 port 60196: Host is down
debug1: do_cleanup debug3: PAM: sshpam_thread_cleanup entering debug3: mm_request_receive: entering debug1: do_cleanup debug1: PAM: cleanup debug1: PAM: closing session debug1: PAM: deleting credentials debug3: PAM: sshpam_thread_cleanup entering ```...appears a bit like both parties blaming each other... client tells the remote host has closed the connection, and the remote host complains about the client beeing down.
Kind regards Matthias
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