bad udp checksums

[Michael Tautschnig]

Hi Robert,

> Hi,
> not sure it's a FAI-related problem (seems to me rather connected with
> DHCP), but I've never encountered this without FAI...
> 
> I'm trying to bootstrap a demo client in VirtualBox (Bridged Networking)
> with FAI (3.3.5ubuntu3 from the Ubuntu PPA). It gets the TFTP image and
> boots up just fine, until at one point the following error message appears:
> 
> <snip>
> [    9.251728] eth0: link up
> IP-Config: eth0 hardware address 08:00:27:10:f9:213 mtu 1500 DHCP RARP
> </snip>
> 
> On the server side of things the following is logged:
> 
> <snip>
> Aug 16 19:41:54 cray dhcpd: 5 bad udp checksums in 5 packets
> </snip>
> 
> I've already tried different NICs in the VirtualBox guest, but no avail.
> Google doesn't reveal anything helpful. Any ideas?
> 

I think I have seen such error messages (although these have not been fatal over
here) when using DHCP relays. Which network devices do you have interconnecting
the virtual client and your FAI server? Does the same server work for other
hosts?

You might also want to use wireshark or something similar on the server to
inspect the packets.

Best,
Michael

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