I can confirm this bug. I was trying to set up a DHCP server on Ubuntu Feisty Fawn and I notice that no responses were received from clients (also running Ubuntu), so I uses wireshark to capture packets and seems that UDP Checksum are incorrect, so offers get dropped.
I sent a message to dnsmasq mailing list and the answer was: "The explanation for dhclient ignoring the DHCPOFFERS seems to be that the UDP checksum is incorrect. Is the Ubuntu system the client, or the server? The checksum problem seems to be originating on the server, and if the server is running Ubuntu (or any Linux distro) then it's a kernel problem: on Linux dnsmasq delegates UDP and IP header creation to the kernel. [CUT]" Link to the message: http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2007q3/001501.html Reply: http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2007q3/001502.html Look at the wireshark capture file: DHCPOFFER packets have an incorrect UDP Checksum, however DHCPDISCOVER packets are ok. Server: Linux steven-desktop 2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686 GNU/Linux Client: Linux steven-laptop 2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686 GNU/Linux ** Attachment added: "Wireshark capture file" http://launchpadlibrarian.net/8541834/dhcp-capture -- ethereal and tcpdump show a lot of packets with incorrect checksum https://bugs.launchpad.net/bugs/31273 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
