[Buildbot] #3183: fix network "spottiness" on new infra

[Buildbot trac]

#3183: fix network "spottiness" on new infra
---------------------+--------------------------
Reporter:  dustin    |       Owner:
    Type:  defect    |      Status:  new
Priority:  critical  |   Milestone:  sys - other
 Version:            |  Resolution:
Keywords:            |
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Comment (by dustin):

 Got it!  On service2:
 {{{
 # tcpdump -i vlan0 -n -p ip host 192.168.80.235
 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
 listening on vlan0, link-type EN10MB (Ethernet), capture size 65535 bytes
 capability mode sandbox enabled
 22:15:52.421511 IP 192.168.80.240.33466 > 192.168.80.235.25: Flags [S],
 seq 3465709852, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val
 1308130274 ecr 0], length 0
 22:15:55.443641 IP 192.168.80.240.33466 > 192.168.80.235.25: Flags [S],
 seq 3465709852, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val
 1308133297 ecr 0], length 0
 22:15:58.690641 IP 192.168.80.240.33466 > 192.168.80.235.25: Flags [S],
 seq 3465709852, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val
 1308136544 ecr 0], length 0
 22:16:01.901640 IP 192.168.80.240.33466 > 192.168.80.235.25: Flags [S],
 seq 3465709852, win 65535, options [mss 1460,nop,wscale 6,sackOK,TS val
 1308139755 ecr 0], length 0
 }}}
 while on service1:
 {{{
 # tcpdump -i vlan0 -n -p ip host 192.168.80.240 or ip host 192.168.80.241
 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
 listening on vlan0, link-type EN10MB (Ethernet), capture size 65535 bytes
 capability mode sandbox enabled
 }}}
 (nothing).

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Ticket URL: <http://trac.buildbot.net/ticket/3183#comment:20>
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