nic_bridge DHCP problem

[Stefan Kalkowski]

Hello Markus,

thank you very much for discovering the cause! Yes, you're right
parentheses make sense here ;-)

regards
Stefan

On 17.09.2012 17:31, Markus Partheymueller wrote:
> 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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-- 
Stefan Kalkowski
Genode Labs

http://www.genode-labs.com/ · http://genode.org/