fxp(4) checksum (offloading?) errors
- From: Cédric Jonas <cedric@xxxxxxxxxxxxx>
- Date: Wed, 31 Jan 2007 21:47:05 +0100
Hi,
I get TCP/UDP checksum errors with fxp(4). I noticed it after using
Wireshark today:
Checksum: 0xac18 [incorrect, should be 0xfbc7 (maybe caused by
checksum offloading?)]
for example.
If I understand it more or less correctly, checksum offloading is
performed by or with help of the NIC - only for TCP and UDP, where the
checksum fails exactly...
I didn't found a way to disable it, so I assume it's a bug in the
driver... I don't know exactly which infos I must provide additionally
to the following, so don't hesitate to ask more :)
Used NIC:
fxp0: <Intel 82550 Pro/100 Ethernet> port 0xa400-0xa43f mem
0xfb030000-0xfb030fff,0xfb000000-0xfb01ffff irq 16 at device
7.0 on pci2
Used system:
FreeBSD ganymed 7.0-CURRENT FreeBSD 7.0-CURRENT #0: Sun Jan 21
16:07:51 CET 2007
root@ganymed:/usr/obj/usr/src/sys/GANYMED i386
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