bad tcp/udp checksums with broadcom cards.

[Tim Hawkins]

On Monday 05 April 2004 14:52, Mipam wrote:

Im getting the same problem with my Intel 82544XT PRO/1000 MT Gigabit Ethernet 
Controller.  (Dell 600SC server, onboard card) 

04:38:19.775211 bsd02.contentspace.priv.49179 > cs02.contentspace.priv.domain: 
[bad udp cksum 5732!]  4740+ PTR? 250.255.255.239.in-addr.arpa. (46) (ttl 64, 
id 1175, len
 74)
04:38:19.775777 cs02.contentspace.priv.3566 > router.contentspace.priv.domain:  
7535+ [1au] PTR? 250.255.255.239.in-addr.arpa. (57) (ttl 128, id 5152, len 
85)
04:38:19.793141 router.contentspace.priv.domain > cs02.contentspace.priv.3566:  
7535 NXDomain 0/1/1 (114) (ttl 254, id 17321, len 142)
04:38:19.793514 cs02.contentspace.priv.domain > bsd02.contentspace.priv.49179:  
4740 NXDomain 0/1/0 (103) (ttl 128, id 5153, len 131)
04:38:19.793897 bsd02.contentspace.priv.49180 > cs02.contentspace.priv.domain: 
[bad udp cksum 9361!]  4741+ PTR? 166.0.168.192.in-addr.arpa. (44) (ttl 64, 
id 1176, len 7
2)
04:38:19.794393 cs02.contentspace.priv.domain > bsd02.contentspace.priv.49180:  
4741* 1/0/0 166.0.168.192.in-addr.arpa. (67) (ttl 128, id 5154, len 95)
04:38:19.794913 bsd02.contentspace.priv.49181 > cs02.contentspace.priv.domain: 
[bad udp cksum 57d9!]  4742+ PTR? 129.14.0.193.in-addr.arpa. (43) (ttl 64, id 
1177, len 71
)




> Hi,
>
> (I allready posted this message without a subject, which isnt nice so i
> post it again, forgive me).
>
> I've some dell poweredges with broadcomcards in them:
>
> bge0: <Broadcom BCM5704C Dual Gigabit Ethernet, ASIC rev. 0x2002> mem
> 0xfcd20000
> -0xfcd2ffff,0xfcd30000-0xfcd3ffff irq 16 at device 0.0 on pci2
> bge0: Ethernet address: 00:0b:db:93:c5:c4
> miibus0: <MII bus> on bge0
> brgphy0: <BCM5704 10/100/1000baseTX PHY> on miibus0
> brgphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseTX,
> 1000baseTX-FDX, auto
>
> However on all of these systems i encounter this in tcpdump:
>
> 14:51:49.845 x.x.x.x.22 > x.x.x.x.3599: P 444:784(340) ack
> 53 win 32850 (DF) [tos 0x10]  (ttl 64, id 21535, len 380, bad cksum 0!)
> 14:51:49.863740 x.x.x.x.3599 > x.x.x.x.22: P 53:105(52) ack 280
> win 64128 (ttl 126, id 24085, len 92)
> 14:51:49.864327 x.x.x.x.3599 > x.x.x.x.22: . [tcp sum ok]
> 105:105(0) ack 784 win 63624 (ttl 126, id 24086, len 40)
> 14:51:49.865208 x.x.x.x.3599 > x.x.x.x.22: P 105:157(52) ack
> 784 win 63624 (ttl 126, id 24088, len 92)
> 14:51:49.865231 x.x.x.x.22 > x.x.x.x.3599: . [bad tcp cksum
> 505b!] 784:784(0) ack 157 win 32824 (DF) [tos 0x10]  (ttl 64, id 21536,
> len 40, bad cksum 0!)
>
> Has this to do with tcp checksum offloading?
> Should i turn it off? And if so, how to turn it off?
> Or is this correct and no problem?
> Does this card got segmentation offload and other offloads?
> Any hints?
> Bye,
>
> Mipam.
>
>
>
> _______________________________________________
> freebsd-questions at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to
> "freebsd-questions-unsubscribe at freebsd.org"