On Tue, 4 Feb 2025 17:01:04 +1100 David Gibson <david(a)gibson.dropbear.id.au> wrote:With the hacky workaround, the connect() now success, but I still couldn't send data from the target. From strace, the target side passt doesn't seem to be attempting doing any writes to the socket, but I'm not sure why yet. pcap on the target side does show some packets on the stream coming from the guest, although it's only one byte (0x0a) and I thought I'd typed 5ish. It then appears to retransmit several times without getting an ack from passt.It looks like an issue with the window, I had something similar before it occurred to me that I had to set the window scaling. Perhaps my hardcoded value isn't good enough, after all. Can you share the pcap? -- Stefano