I will try another em card in that server to confirm/rule out the nic
driver. I am seeing the same checksum number on both the source machine,
the dhcp server machine, and a 3rd windows xp machine sniffing the
traffic with etherreal/wireshark. The windows xp box is running an intel
nic as well, and those 0.0.0.0.67 -> 255.255.255.255.68 packets as seen
by the server do have the correct checksum. After the nic test, if no
change from one driver to the other, then I'll try to un-patch the bpf.c
change.
At this point it is acting like the checksum offloading (which I did
disable on both the client and server) just isn't working.
Will let you know.
-Jon
Danny Braniss wrote:
Can someone please confirm or rule out my issue with dhclient sending
bad IP checksum packets. It would really suck if 7.1 was released with a
broken DHCP client.
I've had many problems lately, but none involved checksum nor the dhcpd
(btw, I assume that you are seeing bad checksum on the receiving server)
could you add a nic to your PE1750?
danny
Jonathan Feally wrote:
Sorry for the cross-post, but this could be either lists problem.
I have 2 boxes running 7-STABLE as of 20081130, both i386 SMP. One is
running ISC DHCPD 3.0.x from recent ports, and the other dhclient from
make world.
The server is refusing to answer the DISCOVER request, as it thinks
the IP checksum is wrong, which tcpdump also confirms. Other DHCP
clients are working fine on this network, so I do not believe it to be
the network, server or dhcpd.
Server is running a 2 Port Intel card - em driver.
Client is a Dell PE1750 with 2 onboard NIC's - bge driver.
I have tried turning off both RXCSUM and TXCSUM on both the client and
server machines with no luck. I also tried the second NIC on the
server with the same result.
This setup was working just a couple of weeks ago, and the only thing
that has changed is updating the src for a make world. PXE booting
this server does result in an IP being issued, so it is pointing
towards something new/changed in 7-STABLE.
I have attached a 3 packet dump of the DISCOVER requests.
Can anybody shed some light on this for me?
Thanks, -Jon
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