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
smime.p7s
Description: S/MIME Cryptographic Signature