networking related issue

[Qamar_7]

Hi,

I am not able to ping to and from other subnets to my hp-ux 11i servers (3 diff servers with same problem). default gateway has been added. there is no issue with default gateway. strange thing is that for few minutes I can ping /telnet to my hp servers then the connection suddenly goes This happens only when I am trying to connect from other vlan/subnet. so what all I need to check? and what is the exact syntax to add a route in hp-ux11i.

thanks,
Qamar

[Ajaykrishnan K N]

Hi

I feel your Gateway is not proper either at the clients or at the servers. Try to ping the gateway from the servers as well as the clients. Check you have entered proper subnet mask also.

if you have to add route use these commands
use this example

#route add net 192.168.4.0 netmask 255.255.255.0 192.168.2.1

for adding a default route use this command

#route add default 192.168.2.1 1

Rgds,

Ajay

[Mohanasundaram_1]

Hi Qamar,

Are you able to ping to your default gateway from all the 3 HP-UX servers? anytime?

Is the problem only for reaching the systems on a different subnet?

Consider checking the ndd parameter ip_ire_gw_probe and setting it appropriately. By default it is enabled, if your gateway does not allow ICMP packets (ping) then disable this parameter, the steps for disable/enable is given in the threads below.

CHeck the following threads for more details on this,
http://forums1.itrc.hp.com/service/forums/questionanswer.do?admit=716493758+1096722954263+28353475&threadId=210183

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=653581

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=541669


I am presuming that you have ruled out the basic hardware related problems and duplex setting on the HBA and switch side.

With regards,
Mohan.

[Fadia Almarei]

Dear Qamer
i think your problem is a network problem i faced dsomething like this ,so
1- first check that the configuration for the lan is correct by using, lanscan command and ifconfig command
2- before that see it the cable is ok
3- then see your network team to follow this problm it may be a switch or routing problem.
BR,
Fadia

[Steven E. Protter · Accepted solution]

Several possible casues:

1) You tried to bring up two lan cards on the same network. That is not possible on 11i v1
if ip is 192.168.0.10 and netmask is 255.255.255.0 then the network is the first three octets 192.168.0 Doioing this with two nics is not a problem on Linux or Windows.

2) There are duplicate ip addresses on the network. Shut down the hp boxes and ping their ip addies. Do it for a while. If there are duplicates out there, talk to network administration and get unique addresses.

These are in addition to the good steps already posted.

SEP

[Qamar_7]

Hi All,

Thanks much for all your efforts to reply back to my query..actually next morning when I came back to office, problem got resolved automatically. no idea why it would have happened...need to find out root cause. once I find the rc I'll let you know. once again I thank you all for your responce.

Regds,
Qamar

[Muthukumar_5]

I think your problem will be because of network routing and ip-address configuration there.

You can get the routing informations as.

netstat -rn

All interface ip-address configuration as,

netstat -in

Default setting of system will be there in /etc/rc.config.d/netconf file. If you modify network temporarily so that you may get problem there. After reboot default ( good ) setting will be changed and made problem solved there.