topic Re: connectivity issues in Operating System - HP-UX

connectivity issues

scoooot — Thu, 12 Feb 2009 23:17:13 GMT

I have an ia64 hp server BL860c running HP-UX B.11.31 and something is causing me connectivity issues.

I can reboot the server and everything is fine, everything works as it should. I can SSH to the host, I can ftp to the host, etc. After a few minutes my SSH session disconnects and I can no longer FTP to the host. I'm sure these are symptoms of the real problem. And it doesn't matter if I am SSH attached or not the service disapears after a few minutes.

I am behind a firewall, SSH rules are there. This is almost like a dead gateway detection but I've turned off the detection.

ndd -get /dev/ip ip_ire_gw_probe
0

Also have set /etc/rc.config.d/nddconf file to the only entry in the file:
TRANSPORT_NAME[0]=ip
NDD_NAME[0]=ip_ire_gw_probe
NDD_VALUE[0]=0

I've installed the newest patch bundles and everything I could find for the 1000Gb NICS.

/var/adm/syslog/syslog.log shows nothing

This is a new build and and my first HP-UX BL860 experience. I've tried everything I know. Before I go back to the network boys and have them go through their rules and or watch the IP traffic on that line I wanted to throw it out there and perhaps someone has seen this before. It seems, given the symptoms, this might be more at the OS level. That's my thought anyway.

Thank you, your help is very much appreciated.

Re: connectivity issues

Turgay Cavdar — Wed, 18 Feb 2009 08:02:19 GMT

When the problem happens , can you ping your 11.31 server from any server on the same subnet? It may be firewall issue..

Re: connectivity issues

scoooot — Wed, 18 Feb 2009 16:24:31 GMT

Figured it out. It was an IP address conflict with a windows server. Someone grabbed the same address and did not put the entry in DNS. My HP-UX host was entered in DNS with the conflicted IP, in conflict. We both grabbed the address at the same time. Sounds simple and we should have figured it out right away and I've already given myself a hard slap. I hate windows even more now.

Thank you Turgay for your reply.

Re: connectivity issues

Avinash20 — Wed, 18 Feb 2009 16:29:56 GMT

If there is an IP conflict you could find it via

# netfmt -f /var/adm/netfmt.LOG000

Re: connectivity issues

scoooot — Wed, 18 Feb 2009 16:58:16 GMT

wow I learned something today. Thanks for that command. I've added it to my cookbook. (-:

Re: connectivity issues

OldSchool — Wed, 18 Feb 2009 17:49:17 GMT

"Someone grabbed the same address..."

THATs the person that needs slapped

Re: connectivity issues

scoooot — Wed, 18 Feb 2009 17:54:14 GMT

There was a pilot flying a small single engine charter plane, with a couple of very important executives on board. He was coming into Seattle airport through thick fog with less than 10m visibility when his instruments went out. So he began circling around looking for landmark. After an hour or so, he starts running pretty low on fuel and the passengers are getting very nervous. Finally, a small opening in the fog appears and he sees a tall building with one guy working alone on the fifth floor. The pilot banks the plane around, rolls down the window and shouts to the guy "Hey, where am I? To this, the solitary office worker replies "You're in a plane." The pilot rolls up the window, executes a 275 degree turn and proceeds to execute a perfect blind landing on the runway of the airport 5 miles away. Just as the plane stops, so does the engine as the fuel has run out.

The passengers are amazed and one asks how he did it. "Simple" replies the pilot, "I asked the guy in that building a simple question. The answer he gave me was 100 percent correct but absolutely useless, therefore that must be Microsoft's support office and from there the airport is just a while away."