After scapy fuzz traffic , packets from vm can get stuck in its kernel queues

[Vedamurthy Joshi]

R2.20 Build 115 Ubuntu 14.04 Juno multi-node setup

On a 14.04 VM, when I run the below python code multiple times. ...sometimes, the VM loses connectivity with everyone else. Ping/ssh etc fails.

The packets from other vms reach the vm, but they either seem to be dropped or stuck there.

Restarting contrail-vrouter-agent service brings back the VM to working state.

root@nodek1:~# cat /tmp/program.py

from scapy.all import *
a=fuzz(IP(dst='92.246.1.4')/Raw(RandString(size=300)))
send(a, count=1000, inter=0, iface='eth0')
root@nodek1:~#

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"tc -s qdisc show" on the VM shows backlog of packets incrementing

In another attempt, ingressing icmp packets were counted in 'netstat -s' output as IpNoECTPkts in IpExt section.