someone says: I have seen similar effects by several reasons: - disallow icmp and mtu mismatch between networks (e.g. different networks with then ethernet). - Split routes - firewall timeouts - auto negotiation ======== Stalled "scp" session Symptom: When "scp" huge files (> 4GB) between hosts, it stalls forever at random instants. It even happens with ftp/rsync. Two reasons may attribute to this