Thread: Eucalyptus 2.0 Ubuntu 10.10 instance not pinging public network unless iptables

hello,
i'm have following problem:
clc - eth0 - public ip isp , eth1 192.168.10.1
on nc-s have eth0 192.168.10.2-7

when start instance gets public ip range of
192.168.10.150-200 , private ip 17.16.1.2-100 .
problem when start instance , ssh cannot ping
outside world. after reading alot of posts put
iptables -t nat -i postrouting -s 172.19.1.0/27 -o eth0 -j masquerade
rule on clc instance start pinging.
great if permament state. if turn
off instance , start 1 doesn't ping outside world as
long put again iptables -t nat -i postrouting -s 172.19.1.0/27 -o
eth0 -j masquerade.

, funniest part:
have checked iptables -l , rule stays there time.
weird thing can start 1 instance , insert the
iptables -t nat -i postrouting -s 172.19.1.0/27 -o eth0 -j masquerade
, start pinging outside world. while i'm pinging outside
world first instance start second instance , while the
first 1 pinging outside world second doesn't unless i
insert iptables -t nat -i postrouting -s 172.19.1.0/27 -o eth0 -j
masquerade again on clc.

idea whats problem? i'll grateful play it
on week now.

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