Re: Strange networking issue

From: Willeat, Todd (TWilleat_at_MHP.SMHS.COM)
Date: 04/25/03

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Date:         Fri, 25 Apr 2003 10:17:37 -0500
To: aix-l@Princeton.EDU

netstat -rn:
Routing tables
Destination Gateway Flags Refs Use If PMTU Exp
Groups

Route Tree for Protocol Family 2 (Internet):
default 170.29.112.1 UGc 0 0 en2 - -
127/8 127.0.0.1 U 55 92886 lo0 - -
170.29.112/24 170.29.112.254 U 86 79422468 en2 - -
170.29.113.17 170.29.112.1 UGHW 2 8644 en2 1500 -
170.29.113.40 170.29.112.1 UGHW 1 6932 en2 1500 -
170.29.113.56 170.29.112.1 UGHW 2 2361 en2 1500 -
170.29.113.122 170.29.112.1 UGHW 1 2492 en2 1500 -
170.29.113.125 170.29.112.1 UGHW 2 68111 en2 1500 -
170.29.113.161 170.29.112.1 UGHW 1 8054 en2 1500 -
170.29.113.202 170.29.112.1 UGHW 1 746 en2 1500 -
170.29.113.213 170.29.112.1 UGHW 2 28642 en2 1500 -
170.29.114.253 170.29.112.1 UGHW 1 11 en2 1500 -
170.29.227.16 170.29.112.1 UGHW 2 2440 en2 1500 -
170.29.227.89 170.29.112.1 UGHW 1 670 en2 1500 -
170.29.227.141 170.29.112.1 UGHW 1 2083 en2 1500 -
170.29.227.144 170.29.112.1 UGHW 1 598 en2 1500 -
170.29.227.159 170.29.112.1 UGHW 1 2971 en2 1500 -
170.29.227.196 170.29.112.1 UGHW 1 132 en2 1500 -
170.29.227.198 170.29.112.1 UGHW 1 121 en2 1500 -
170.29.227.200 170.29.112.1 UGHW 1 107 en2 1500 -
170.29.227.201 170.29.112.1 UGHW 1 127 en2 1500 -
170.29.232/26 170.29.232.54 U 1 3739 en0 - -
224.0.1.22 170.29.112.1 UGHW 1 2 en2 - -
225.1.9.98 170.29.112.1 UGHW 1 1 en2 - -

Route Tree for Protocol Family 24 (Internet v6):
::1 ::1 UH 0 0 lo0 16896 -

ifconfig -a:
en0:
flags=4e080863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64B
IT,PSEG>
        inet 170.29.232.54 netmask 0xffffffc0 broadcast 170.29.232.63
en2:
flags=e080863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BI
T>
        inet 170.29.112.254 netmask 0xffffff00 broadcast 170.29.112.255
lo0:
flags=e08084b<UP,BROADCAST,LOOPBACK,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT>
        inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255
        inet6 ::1/0

-----Original Message-----
From: Holger.VanKoll@SWISSCOM.COM [mailto:Holger.VanKoll@SWISSCOM.COM]
Sent: Friday, April 25, 2003 3:43 AM
To: aix-l@Princeton.EDU
Subject: Re: Strange networking issue

yes, there should be no routing, but it is!
traceroute should exit after 1 "hop"

post output of

netstat -rn
ifconfig -a

-----Original Message-----
From: Willeat, Todd [mailto:TWilleat@MHP.SMHS.COM]
Sent: Friday, April 25, 2003 6:56 AM
To: aix-l@Princeton.EDU
Subject: Re: Strange networking issue

There shouldn't be any routing since both boxes are on the same
subnet... But, if it helps, here's the traceroute info:

trying to get source for mhp-aquaman
source should be 170.29.112.254
traceroute to mhp-aquaman (170.29.112.30) from 170.29.112.254
(170.29.112.254), 30 hops max outgoing MTU = 1500 1 * * * 2 * * * 3
* * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 *
* * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * *
* 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * *
25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * *

-----Original Message-----
From: John Jolet [mailto:john.jolet@FXFN.COM]
Sent: Thursday, April 24, 2003 8:16 PM
To: aix-l@Princeton.EDU
Subject: Re: Strange networking issue

really, really sounds like a routing issue...what does a traceroute from
the aix to win2k box look like?

-----Original Message-----
From: Willeat, Todd [mailto:TWilleat@MHP.SMHS.COM]
Sent: Thursday, April 24, 2003 5:22 PM
To: aix-l@Princeton.EDU
Subject: Strange networking issue

Hi all,

I have a strange network connectivity issue between a p640 box (AIX
4.3.3
ML11) and a Win2K box (SP3). Both boxes are on the same subnet (and same
switch), but are having problems pinging each other. The Win2K box has
no problem connecting to other boxes, and people can telnet to the AIX
box. The Win2K box has 6 GigE connections in an 802.3ad dynamic team.
The p640 box has a SysKonnect dual-port GigE card running in failover
mode (as well as the 2 integrated 10/100s - I have one of these on
another subnet and the Win2K box can ping that just fine...). Looking at
the arp tables shows that each box knows the other's MAC address. My
network admin captured some packets between the 2 and this is what we
saw:

Pinging from Win2K to AIX - we saw the packet go from Win2K to AIX, but
AIX did not return any packets. Pinging from AIX to Win2K - we saw the
packet go from AIX to Win2K and saw the response packet from Win2K to
AIX, but AIX did not receive it (request timed out).

It appears that AIX is dropping the packets from this Win2K box for some
reason (I have several other p640s with the same config that work fine).
However, when I rebooted the Win2K box (after it locked up...), I could
then ping between the boxes. But this only lasted for a day or so, and
now it is not working again.

Has anyone seen anything like this before?

               _______________________________________
              / Todd A. Willeat \
             | UNIX Administrator |
             | Mercy Health Plans |
             | 425 South Woods Mill Road |
           _ | Chesterfield, Missouri 63017-3492 | _
          / )| (314) 214-2329 / (314) 214-8202 (fax) |( \
         / / | twilleat@mhp.mercy.net | \ \
       _( (_ | http://www.mercyhealthplans.com/ | _) )_
      (((\ \> \/->___________<-=-=-=-=->___________<-\/ </ /)))
      (\\\\ \_/ / \ \_/ ////)
       \ / \ /
        \ _/ \_ /
        / / \ \
       /___/ \___\

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