> Notably, the UML ceases responding to network packets for up to a minute > and a half at a time, then restarts again just as quietly: the > console-on-network-port freezes at the same time. The UML continues > running and packets get queued on either side of the... blockage, and > are allowed through when it lifts. > > Example, pinging every five seconds (this one happened to be a fairly > short blockage): > > 64 bytes from 192.168.14.1: icmp_seq=57 ttl=64 time=1.1 ms > 64 bytes from 192.168.14.1: icmp_seq=58 ttl=64 time=1.3 ms > 64 bytes from 192.168.14.1: icmp_seq=59 ttl=64 time=1.3 ms > 64 bytes from 192.168.14.1: icmp_seq=60 ttl=64 time=1.3 ms > 64 bytes from 192.168.14.1: icmp_seq=61 ttl=64 time=7993.1 ms > 64 bytes from 192.168.14.1: icmp_seq=62 ttl=64 time=14206.3 ms > 64 bytes from 192.168.14.1: icmp_seq=63 ttl=64 time=9219.6 ms > 64 bytes from 192.168.14.1: icmp_seq=64 ttl=64 time=4219.6 ms > 64 bytes from 192.168.14.1: icmp_seq=65 ttl=64 time=1.3 ms > > The blockages happen quite intermittently, but I'd estimate the mean > time between blockages to be about ten minutes. > > The UML has two network interfaces, both bridged tun/tap interfaces: the > one I'm pinging down here, and another, bridged to an ADSL router, > traffic-shaped, and firewalled with iptables. > > (This may be an iptables bug: I'll build a UML without iptables and with > only one interface tonight, and see if the problem still occurs.) > > > Anyone seen anything like this before? Any suggestions as to how I might > debug it? I've had similar issues before. Looks to me like this is a routing problem, check your arp tables and your routes. It may be that something is occasionally causing a packet to come out of the wrong interface/wrong mac, which confuses the lower network layers.
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