On 3/18/21 12:37 PM, RVP wrote:
On Thu, 18 Mar 2021, Louis Guillaume wrote:Ok - i did something similar with "nc" and text files in /var/log. It is able to connect and transfer up to and no more that 6144 bytes before closing. This seems to be consistent with what I was seeing via ssh.Smaller files transfer completely, but anything larger than 6144b is truncated at exactly 6144b == 6k.After some reading, that seems to smell like some kind of MTU or maybe jumbo frame business. All systems here on on gigabit ethernet. Just a hunch. Maybe it's my switch.Try turning jumbo frames off--you don't really need it. Reboot the switch also.I can't rule out the firewall (ipfilter) - but even if that is the cause, this would be unexpected behavior.Try a port (both on nc(1) and sshd) other than 22. -RVP
Hrmpf - looks like jumbo frames are already off... wm1: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500... also a tcpdump shows the largest packet size being 1500, so that all seems in order. It does show the sshd sending an unexpected "RST" packet right before the end, though...
192.168.1.2.22 > 192.168.1.126.64517: Flags [R], cksum 0xbd47
... which leads me to think it's something with sshd now.
