topic Two IPs on on NIC --> CDE refuses to work in Operating System - HP-UX

Two IPs on on NIC --> CDE refuses to work

Juuso Siniketo — Wed, 20 Sep 2000 04:46:52 GMT

Hi,

I have configured two IP?s on one NIC(lan0:0 and lan0:1) and the addresses belong to different subnets.

Problem is that CDE won?t work anymore. When I try to login the screen goes blank and pops me right back to the login screen.

The configuration works fine with CDE if both addresses belong to the same subnet.
I?m running HP-UX 11.00 on C3600.

Re: Two IPs on on NIC --> CDE refuses to work

R.Suresh — Wed, 20 Sep 2000 04:55:45 GMT

Hi,

It can be due to the Hostname conflict.

Please check your /etc/hosts &

/etc/rc.config.d/netconf

Better run
set_parms initial
give the host & ip details once again.
restart the system, it should work.

Thanks
R.Suresh.

Re: Two IPs on on NIC --> CDE refuses to work

Stefan Farrelly — Wed, 20 Sep 2000 06:29:13 GMT

This is a know problem with HP-UX, trying to run 2 IPs on the same card but to different subnets. Routing gets confused and it just doesnt work at present (problem with HP's TCP stack). Same subnet is ok. HP will be devloping a fix for this in the future but for now your out of luck. This was discussed in detail in another question a while back - do a search for it and you will see other replies. Apparantly it works on a Sun, but not on HP!

Re: Two IPs on on NIC --> CDE refuses to work

Alex Glennie — Wed, 20 Sep 2000 06:39:50 GMT

I'm not sure if this is supported by HP or the other members of COSE who ship CDE. I wouldn't be at all surprised of the results you describe ..... however it doesn't necessarily mean it won't work bearing in mind the results from the 2 IP's on the same subnet and from the sound of it the Xserver and dtlogin have appeared ?

You may get info from the following which may help ?

dr_dt (CDE diagnotsc), $HOME/.dt/startlog (users CDE startup), /var/dt/Xerrors (Xserver log) ...you can get more detailed info by adding set -x in .dtprofile for the startlog) or if you choose use the following to debug dtlogin :

edit /usr/dt/config/dtrc.d/90_dtlogin_st
# VL_ARGS=""
VL_ARGS="-debug 9"
If [ -x "$DTLOGIN" ]
then
# exec $DTLOGIN $VL_ARGS ......dev/null ....
exec $DTLOGIN $VL_ARGS /tmp/dtlogin.log 2>&1
else

then restart dtlogin parent process

Re: Two IPs on on NIC --> CDE refuses to work

Anthony Goonetilleke — Wed, 20 Sep 2000 16:57:55 GMT

Yes there is definitely a problem with routing logical interfaces on different subnets, it has something to do with routing the same MAC address across itself have a look at DOC ID W3594854 it basically says you cannot do it, although I have done this with two seperate network cards there is no problem

Re: Two IPs on on NIC --> CDE refuses to work

Juuso Siniketo — Thu, 21 Sep 2000 05:36:28 GMT

Ok, thanks for everybody. Anyway I thought to mention that it?s possible to use such a configration (2 IPs / 2 subnets / 1 nic) with CDE if you make the necessary network modifications when CDE is already running.. Just don?t exit or kill it ;)

Re: Two IPs on on NIC --> CDE refuses to work

Mike Stroyan — Fri, 22 Sep 2000 18:57:26 GMT

Two IPs on one NIC goes beyond what this actually refers to, but it still might help-
Apply patch PHSS_20864. That is the current successor to patch PHSS_20716 which includes the fix-

1. Users are unable to login to CDE on the local console under HP-UX 11.0 when multiple network cards are installed.