Github user ustcweizhou commented on the issue: https://github.com/apache/cloudstack/pull/1743 @The-Loeki as I remember, that is a bug in dhcp3-client. The issue does exist in Ubuntu 12.04 (guest vm), but fixed in Ubuntu 12.04.3. (I can not find the related link now). Anyway, the iptables rules fix the issue permanently.
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