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On 08/09/2012 12:13 AM, Alessandro Tagliapietra wrote:
Hello guys, i've just installed kernel 3.4 from Ubuntu kernel PPA archive and after this upgrade VM aren't able to get the DHCP address but with tcpdump i see the request and offer on the network. Someone else experienced this? I've tried also with 3.3, same story. Rolling back to 3.2 and everything works fine. I've tried with both flatdhcp and vlan mode. Best Alessandro
Hey Alessandro-I'm able to confirm this affects the quantal kernel (on both quantal and precise) and vanilla kernels since 3.2.26 (at least those available from http://kernel.ubuntu.com/~kernel-ppa/mainline/) I began looking at this issue a while back and doing some packet dumping, but I seem to have misplaced those .pcaps. IIRC, what I saw happening was the instances' DHCP DICOVERY makes it to the server, dnsmasq properly sends an OFFER, but the the instance never returns with the REQUEST. I feel like, at one point, I was seeing an external DHCP server (on the public network) responding to the DISCOVERYs with OFFERs of addresses from the wrong network, and the instance actually REQUEST'ing and getting an IP from the wrong server.
I will open a bug about this in Launchpad against the kernel and see if we can get some help bisecting and figuring out what broke.
Adam
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