(no subject)

From: Mipam (mipam_at_ibb.net)
Date: 04/05/04

  • Next message: Ruslan N. Gogunsci: "Re: Mozilla -- No running window." 
    Date: Mon, 5 Apr 2004 13:45:28 +0200 (MET DST)
To: <freebsd-questions@freebsd.org>

    Hi, 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 enconter 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?
    Any hints?
    Bye,

    Mipam.

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