Ping packets from AIX

Ping packets from AIX

Post by Robert DiRosar » Fri, 04 Jul 2003 10:19:43



I have an 7013/59H with AIX 4.3.3 at home on my network.  I haven't
touched the box in a couple of days.  (I have root logged in on the
console.  I telnet'd in to my user account from my Linux box a couple
of days ago.)

While running a packet sniffer on my Linux box I found an ICMP ping
request from my AIX box to my Linux box!  It sends a ping every 600
seconds.  Why is AIX sending ping packets to my Linux box?

(My Linux box is connected to a fast ethernet switch.  One port of the
switch goes to a fast ethernet port on my NetBuilder-2 router.  The
AIX box is on a different (slow) ethernet segment on the router.)

Thanks
Robert

 
 
 

Ping packets from AIX

Post by Dirk Gentl » Fri, 04 Jul 2003 11:01:06



Quote:> I have an 7013/59H with AIX 4.3.3 at home on my network.  I haven't
> touched the box in a couple of days.  (I have root logged in on the
> console.  I telnet'd in to my user account from my Linux box a couple
> of days ago.)

> While running a packet sniffer on my Linux box I found an ICMP ping
> request from my AIX box to my Linux box!  It sends a ping every 600
> seconds.  Why is AIX sending ping packets to my Linux box?

Keep-alive packets from your telnet session?

 
 
 

Ping packets from AIX

Post by theycallmet » Fri, 04 Jul 2003 23:51:22


Do you have

tcp_pmtu_discover = 1 in network options?

no -a | grep pmtu

This will cause a ICMP Echo Request to be sent every 10 mins (600
seconds) for MTU discovery.  You can disable it by setting the value
to 0.  See if that works.

no -o tcp_pmtu_discover=0
no -o udp_pmtu_discover=0

 
 
 

Ping packets from AIX

Post by Robert DiRosar » Sat, 05 Jul 2003 00:28:48





> > I have an 7013/59H with AIX 4.3.3 at home on my network.  I haven't
> > touched the box in a couple of days.  (I have root logged in on the
> > console.  I telnet'd in to my user account from my Linux box a couple
> > of days ago.)

> > While running a packet sniffer on my Linux box I found an ICMP ping
> > request from my AIX box to my Linux box!  It sends a ping every 600
> > seconds.  Why is AIX sending ping packets to my Linux box?

> Keep-alive packets from your telnet session?

The telnet session only lasted a few minutes two days ago.
Would an ICMP packet be used to keep an TCP connection open?
I have noticed that after I view a web site I do get packets back,
even after I exit Netscape.  I think they are TCP, not ICMP.

Thanks
Robert

 
 
 

Ping packets from AIX

Post by Alberto 'JCN-9000' Varesi » Sat, 05 Jul 2003 16:19:10



>>>While running a packet sniffer on my Linux box I found an ICMP ping
>>>request from my AIX box to my Linux box!  It sends a ping every 600
>>>seconds.  Why is AIX sending ping packets to my Linux box?

PMTU Discovery ?

no -a | grep disc
  pmtu_rediscover_interval = 30
         udp_pmtu_discover = 0
         tcp_pmtu_discover = 0

--
  Alberto 'JCN-9000' Varesio     AKA  BlueRider   AIX pSeries System Admin
  EADS-MDTV - Via Goito 51/A    Riding the world  Jeeper on Black '01TJ4.0
  10195 Grugliasco (TO) ITALY    on HONDA CB500    Phone: +39-011-415-8148

  Please http://www.fsf.org/philosophy/no-word-attachments.html, thanks!
--
  Recursive,adj.; see recursive.

 
 
 

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--Milt


University of Illinois     Computing and Communications Services Office
1447 Digital Computer Lab.                             Fax:217-244-7089
1304 W. Springfield  Urbana IL 61801                 Phone:217-333-6264

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