IP bad-len 0

Krassimir Slavchev krassi at bulinfo.net
Tue Feb 5 10:04:38 UTC 2008


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Hi,
Can you try:
net.inet.tcp.rfc1323=0

Nikolay Pavlov wrote:
> Did someone knows what's that mean?
> 
> root at cassini:~# tcpdump -n host xx.162.141.1 and port 80                                                                                                                                                                             
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on em0, link-type EN10MB (Ethernet), capture size 96 bytes
> 17:04:40.734189 IP xx.162.141.1.47484 > xxx.53.51.235.80: S 
> 3567180455:3567180455(0) win 5840 <mss 1452,sackOK,timestamp 8804899 
> 0,nop,wscale 6>
> 17:04:40.734236 IP xx.53.51.235.80 > xx.162.141.1.47484: S 
> 3608546905:3608546905(0) ack 3567180456 win 8192 <mss 1452,nop,wscale 
> 5,sackOK,timestamp 709854070 8804899>
> 17:04:40.925032 IP xx.162.141.1.47484 > xxx.53.51.235.80: . ack 1 win 92 
> <nop,nop,timestamp 8804947 709854070>
> 17:04:40.933559 IP xx.162.141.1.47484 > xxx.53.51.235.80: P 1:935(934) ack 
> 1 win 92 <nop,nop,timestamp 8804947 709854070>
> 17:04:40.995133 IP bad-len 0
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> I see quite a lot of this messages on my web server xxx.53.51.235 and the 
> connection is a bit sluggish sometimes.
> It's a em card on 7.0-RC1 GENERIC amd64 kernel:
> 
> em0 at pci0:6:0:0: class=0x020000 card=0x109a15d9 chip=0x109a8086 rev=0x00 
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '82573L Intel PRO/1000 PL Network Adaptor'
>     class      = network
>     subclass   = ethernet
> 
> dev.em.0.%desc: Intel(R) PRO/1000 Network Connection Version - 6.7.3
> dev.em.0.%driver: em
> dev.em.0.%location: slot=0 function=0 handle=\_SB_.PCI0.EXP5.PXS5
> dev.em.0.%pnpinfo: vendor=0x8086 device=0x109a subvendor=0x15d9 
> subdevice=0x109a class=0x020000
> dev.em.0.%parent: pci6
> dev.em.0.debug: -1
> dev.em.0.stats: -1
> dev.em.0.rx_int_delay: 0
> dev.em.0.tx_int_delay: 66
> dev.em.0.rx_abs_int_delay: 66
> dev.em.0.tx_abs_int_delay: 66
> dev.em.0.rx_processing_limit: 100
> dev.sc.0.%desc: System console
> 
> 
> 

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