nic_bridge DHCP problem

[Markus Partheymueller]

I just used a dirty hack which set the udp checksum to 0 in the
nic_bridge and DHCP worked. But now I can't ping the qemu gateway
anymore, which was possible with just using the nic_drv. tcpdump shows
that qemu replies, but the reply doesn't come through. It seems to me
that the bridging has some problems.

On 14 September 2012 16:29, Alexander Domo <domo at ...62...> wrote:
> I confirm this problem.
> Although I was using VMware, and it could only be reproduced on some physical machines, and worked perfectly on others. DHCP just didn't get through.
>
> 14.09.2012, в 16:38, Markus Partheymueller <mail at ...119...> написал(а):
>
>> Hey folks,
>>
>> I'm having some trouble with the nic_bridge provided. When using the
>> nic_drv as single instance, everything works fine.
>>
>> But when I replace it with the nic_bridge, the requests don't seem to
>> make it through. In qemu's TCP dump, I recognized a difference
>> regarding the DHCP broadcast:
>>
>> 13:08:25.494579 IP (tos 0x0, ttl 64, id 5118, offset 0, flags [none],
>> proto UDP (17), length 341)
>>    0.0.0.0.68 > 255.255.255.255.67: [bad udp cksum 0x9134 -> 0xd233!]
>> BOOTP/DHCP, Request from 02:02:02:02:02:02, length 313, xid
>> 0x292e1940, Flags [Broadcast] (0x8000)
>>          Client-Ethernet-Address 02:02:02:02:02:02
>>          Vendor-rfc1048 Extensions
>>            Magic Cookie 0x63825363
>>            DHCP-Message Option 53, length 1: Discover
>>            MSZ Option 57, length 2: 1500
>>            Vendor-Class Option 60, length 42:
>> "dhcpcd-5.2.7:Linux-3.5.0:i686:NOVA microHV"
>>            Hostname Option 12, length 2: "vm"
>>            Parameter-Request Option 55, length 15:
>>              Subnet-Mask, Classless-Static-Route, Static-Route, Default-Gateway
>>              Domain-Name-Server, Hostname, Domain-Name, MTU
>>              BR, NTP, Lease-Time, Server-ID
>>              RN, RB, Option 119
>>
>> The bad checksum irritated me. When I used the nic_drv session, it
>> worked (checksum OK, qemu's DHCP responds correctly with an IP
>> address). Could there be a problem with the bridge itself or is it
>> definitely my problem? Do you have example setups using the bridge
>> that work?
>>
>> Best,
>>
>> Markus
>>
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