topic Re: subnetting or routing problem in Operating System - HP-UX

subnetting or routing problem

Sebastian Kaczmarek — Wed, 04 Jun 2003 11:44:29 GMT

Hello,

I had to configure subnetting on my HP 11. In netconf I have:
INTERFACE_NAME[1]=lan101
IP_ADDRESS[1]=192.168.235.25
SUBNET_MASK[1]=255.255.255.192

ROUTE_DESTINATION[0]=default
ROUTE_GATEWAY[0]=192.168.235.3
ROUTE_COUNT[0]=1

Of course I have configured nddconf to support subnetting.

My problem is that I can reach devices outside my subnet only after I flash my routing table (route -f). But unfortunatelly it works for a while (30-180 pings). Needlees to say that I cannot see any errors in syslog.
I would be very grateful for any suggestions what can be wrong.

Regards,
sebastian.

Re: subnetting or routing problem

David_246 — Wed, 04 Jun 2003 11:52:51 GMT

Hi sebastian,

Please send us a netstat -rn output working and not working, also a :

for i in `lanscan | awk '{print $5}' | grep lan`
do
ifconfig $i
done

Regs David

Re: subnetting or routing problem

Bill Douglass — Wed, 04 Jun 2003 12:14:49 GMT

Also please post your entore /etc/rc.config.d/netconf file. Specifically, what is the configuration for INTERFACE_NAME[0], etc.

route -f deletes any entries that specify a remote host as a gateway. That will remove your default gateway entry, according to your posting above. I wonder if you have the correct gateway for your subnet.

Also, verify that your subnet mask is correct.

Re: subnetting or routing problem

Michael Steele_2 — Wed, 04 Jun 2003 12:27:10 GMT

Sounds like a router issue. Check with the router manufacturer (* who is it? *). Any switches involved? (* what *)

See what happens if you elminate the router by connecting a cross over cable between subnet nodes.

Re: subnetting or routing problem

Sebastian Kaczmarek — Wed, 04 Jun 2003 12:31:16 GMT

When it is NOT working:
tscpa # netstat -rn
Routing tables
Dest/Netmask Gateway Flags Refs Use Interface Pmtu
127.0.0.1 127.0.0.1 UH 0 1066 lo0 4136
192.168.235.25 192.168.235.25 UH 0 696 lan0 4136
192.168.235.0 192.168.235.25 U 2 0 lan0 1500
default 192.168.235.2 UG 0 0 lan0 1500
tscpa # lan0: flags=843
inet 192.168.235.20 netmask ffffffc0 broadcast 192.168.235.63

When it is working:
tscpa # netstat -rn
Routing tables
Dest/Netmask Gateway Flags Refs Use Interface Pmtu
127.0.0.1 127.0.0.1 UH 0 1066 lo0 4136
192.168.235.25 192.168.235.25 UH 0 696 lan0 4136
192.168.235.0 192.168.235.25 U 2 0 lan0 1500
default 192.168.235.3 UG 0 0 lan0 1500
lan0: flags=843
inet 192.168.235.25 netmask ffffffc0 broadcast 192.168.235.63

My netconf looks like:

Re: subnetting or routing problem

Sebastian Kaczmarek — Wed, 04 Jun 2003 12:41:44 GMT

I am very sorry that my latest response was wrong (I type the command on the wrong machine).
When it is working ro when it isn't working my inconfig lan0 shows exactly the same.

Onse again sorry.
Regards,
sebastian.

Re: subnetting or routing problem

Adam J Markiewicz — Wed, 04 Jun 2003 13:18:41 GMT

Czesc Sebastian. :)

Here have some usefull links:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xae765220af9bd5118ff10090279cd0f9,00.html
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xa75d37f45ef7d4118fef0090279cd0f9,00.html
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xcd529c196a4bd71190080090279cd0f9,00.html

If it's not enough try search on:
'dead gateway detection'

Powodzenia.
Adam

Re: subnetting or routing problem

Massimo Bianchi — Wed, 04 Jun 2003 13:33:35 GMT

hi,
may be you are using dynami routing.

Did you check if gated is active ?

Massimo

Re: subnetting or routing problem

Sebastian Kaczmarek — Wed, 04 Jun 2003 14:22:01 GMT

Thanks a lot to everyone for your help. It was a issue with a detection of a dead router.

Regards,
sebastian.