5.6: WARNING: High TCP connect ...

5.6: WARNING: High TCP connect ...

Post by Brian C Hi » Fri, 30 Apr 1999 04:00:00



        I have tried increasing tcp_conn_req_max_q to 256, but
still see an occasional:

WARNING: High TCP connect timeout rate! System (port 80) may be under a SYN flood attack!

        The I don't see any more dropped listen queue entries.
What do I do now?

Thanks for any help.

--
   _____________________________________________________________________

  | Systems Programmer          University of California, Davis         |
  | Unix Specialist             BCH Technical Services                  |

 
 
 

1. SunOS 5.6/SUNW,Ultra-2: WARNING: High TCP connect timeout

        Anyone seen this?

Mar 19 16:15:00 tinaroo.looksmart.com unix: WARNING: High TCP connect timeout rate! System (port 80) may be under a SYN flood attack!

        I am running a very high traffic web server on this system. I
have applied all of the recommended patches. The banner says:

    (banner-name:)  'Sun Ultra 2 UPA/SBus (2 X UltraSPARC-II 296MHz)'

        It also keeps crashing every hour or so with the attached
daemon.debug messages:

        Any suggestions?

   _____________________________________________________________________

  | Systems Programmer          University of California, Davis         |
  | Unix Specialist             BCH Technical Services                  |
============================================================================
Mar 19 13:43:46 tinaroo.looksmart.com unix: SUNW,hme0: Using Internal Transceive
r
Mar 19 13:43:46 tinaroo.looksmart.com unix: SUNW,hme0: 100 Mbps full-duplex Link
 Up
Mar 19 13:43:46 tinaroo.looksmart.com unix: dump on /dev/dsk/c0t0d0s1 size 52484
8K
Mar 19 13:43:46 tinaroo.looksmart.com unix: BAD TRAP: cpu=1 type=0x28 rp=0x30043
bc8 addr=0x1002ba30 mmu_fsr=0x0
Mar 19 13:43:46 tinaroo.looksmart.com unix: sched: integer divide zero trap:
Mar 19 13:43:46 tinaroo.looksmart.com unix: addr=0x1002ba30
Mar 19 13:43:46 tinaroo.looksmart.com unix: pid=0, pc=0x1002ba30, sp=0x30043c58,
 tstate=0x4400001e03, context=0xdd9
Mar 19 13:43:46 tinaroo.looksmart.com unix: g1-g7: 0, 2, 10, 0, fffffffffff89590
, 0, 30043e80
Mar 19 13:43:46 tinaroo.looksmart.com unix: Begin traceback... sp = 30043c58
Mar 19 13:43:46 tinaroo.looksmart.com unix: Called from 100093dc, fp=30043ce0, a
rgs=10423dec 0 0 0 0 6056cf60
Mar 19 13:43:46 tinaroo.looksmart.com unix: Called from 18c48, fp=efffefd0, args
=91882 84804 73000000 7efefeff 81010100 ff00
Mar 19 13:43:46 tinaroo.looksmart.com unix: End traceback...
Mar 19 13:43:46 tinaroo.looksmart.com unix: panic[cpu1]/thread=0x30043e80: trap
Mar 19 13:43:46 tinaroo.looksmart.com unix: syncing file systems... [4] 4BAD TRA
P: cpu=1 type=0x31 rp=0x300434b8 addr=0x10 mmu_fsr=0x0
Mar 19 13:43:46 tinaroo.looksmart.com unix: sched: trap type = 0x31
Mar 19 13:43:46 tinaroo.looksmart.com unix: addr=0x10
Mar 19 13:43:46 tinaroo.looksmart.com unix: pid=0, pc=0x10058208, sp=0x30043548,
 tstate=0x4480001e02, context=0xdd9
Mar 19 13:43:46 tinaroo.looksmart.com unix: g1-g7: 758, 1042ff94, 8500000039ab26
36, 60cda5d0, 800028c36caaca61, 0, 30043e80
Mar 19 13:43:46 tinaroo.looksmart.com unix: panic[cpu1]/thread=0x30043e80: trap
Mar 19 13:43:46 tinaroo.looksmart.com unix: 12324 static and sysmap kernel pages
Mar 19 13:43:46 tinaroo.looksmart.com unix: e offset 0x8c04000 and slot 0xe offs
et 0x8c06000 and slot 0xe offset 0x8c07000 Onboard device sparc9 ipl 6

c00000

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