nic_bridge DHCP problem

[Markus Partheymueller]

Update on that:

- The DHCP problem is solved as described here:
https://github.com/genodelabs/genode/issues/360
- The other problem was actually my fault.

Cheers

Markus

On 14 September 2012 16:49, Markus Partheymueller <mail at ...119...> wrote:
> 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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