From: Paul.Soltermann@vonroll-isola.com
Date: Thu Aug 05 2004 - 09:33:39 EDT
Hallo,
The following Experts helped finally to solve the problem.
Thanks to:
Roger Best
Craig Johnson
Rita Workman
Thierry ITTY
Gerardo Oliva
Juan Carlos Cruz
Andre Schmid (HP-Support)
Regards
Paul Soltermann
A wrong entry in the routing table was dynamicaly created by "ICMP Redirect" and had to be deleted.
route delete <nnn.nnn.1.40> <nnn.nnn.2.2>
Suggestion from HP-Support
for HP-UX 10.20.
Run this script from cron every 5 minutes :
netstat -rn | awk '$3=/UGHD/ {system ("route delete "$1" "$2" ")}' >
/dev/null
for HP-UX 11.00
# /usr/bin/ndd -get /dev/ip ip_ire_redirect_interval
300000 ( 5 minutes )
Command to set:
# /usr/bin/ndd -set /dev/ip ip_ire_redirect_interval 5000
To maintain the value over a reboot the /etc/rc.config.d/nddconf file
needs to be edited:
TRANSPORT_NAME[3]=ip
NDD_NAME[3]=ip_ire_redirect_interval
NDD_VALUE[3]=5000
Thierry ITTY
to debug routing problems you MUST indicate the network masks. here, we
can
guess it's 255.255.255.0 but nothings confirms this
use netstat -ni or whatever command to check the network interfaces
configurations
use netstat -nr to get each host's routing table
for what I see, server B has no default route, or a bad one, or it's
default router has no route to server A
it might also be a problem of asymmetric routing, policy routing or
firewall filters (allowing one way traffic only ?)
as a sysadmin (I mean not a network admin), if server B pings its default
router (maybe xxx.xxx.2.1 ?) you're ok and you must forward the problem to
network guys
----- Weitergeleitet von Paul Soltermann/ISOLA am 05.08.2004 14:46 -----
"Juan Carlos Cruz" <jccruz@mazda.ec>
04.08.2004 19:51
An: <Paul.Soltermann@vonroll-isola.com>
Kopie:
Thema: Re: [HPADM] Routing problem
Server B # route add net <net1> <gateway net2> 1
Where <net1> = nnn.nnn.1.0 and <gateway net2> = nnn.nnn.2.x
----- Original Message -----
From: Paul.Soltermann@vonroll-isola.com
To: hpux-admin@DutchWorks.nl
Sent: Wednesday, August 04, 2004 9:43 AM
Subject: [HPADM] Routing problem
Hello Admins,
After a rebuild of our network configuration (new routers new IP ranges
etc) I cannot ping my SMTP Server from Server B (in a different network).
The problem occured on a sunday , no-one made any Unix updates.
>From Server A (IP=nnn.nnn.1.60) to SMTP(nnn.nnn.1.40) works fine.
>From Server B (IP=nnn.nnn.2.80) to SMTP(nnn.nnn.1.40) no ping.
Server A:</> # traceroute nnn.nnn.1.40
traceroute to nnn.nnn.1.40(nnn.nnn.1.40), 30 hops max, 20 byte packets
1 vonroll-isola.com (nnn.nnn.1.40) 2 ms 1 ms 1 ms
Server A:</> #
Server A:</> # traceroute nnn.nnn.2.80
traceroute to nnn.nnn.2.80(nnn.nnn.2.80), 30 hops max, 20 byte packets
1 nnn.nnn.200.1 (nnn.nnn.200.1) 1 ms 1 ms 1 ms
2 nnn.nnn.200.3 (nnn.nnn.200.3) 2 ms 2 ms 2 ms
...
...
...
10 hp-app.augsburg.vonroll-isola.com (nnn.nnn.2.80) 84 ms 83 ms 84 ms
Server A:</>
Server B:</># traceroute nnn.nnn.1.40
traceroute to nnn.nnn.1.40 ( nnn.nnn.1.40), 30 hops max, 20 byte packets
1 * * *
2 * * *
3 * *
^c
Where is the problem, how can I find the solution ??
Thanks for any help.
-----------------------------------------
Schweizerische Isola-Werke AG
Paul Soltermann
Passwangstrasse 20
CH-4226 Breitenbach
Phone: +41 61 7855 647 Natel 079 4597835
Email: paul.soltermann@vonroll-isola.com
-----------------------------------------
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