network connectivity dies

[Jerry L. Sims]

Hello All,
**************
HP-UX B.11.11 9000/800/rp7410
***************

Has anyone seen this problem where the network
connectivity totaly dies ? I have no clue why this happens, and this is the second time in a week. I have located in my "syslog.log" where
xntpd looses synchronization :

Apr 23 17:46:42 it-hp57 telnetd[22109]: getpid: peer died: Error 0
Apr 23 17:46:59 it-hp57 xntpd[1351]: synchronisation lost

Apr 27 06:06:12 it-hp57 xntpd[1270]: synchronisation lost
Apr 27 09:26:44 it-hp57 xntpd[1270]: synchronized to 216.131.193.200, stratum=2

On each occurance we ended up unlugging the
lan cable, and plugging it backin to the
lancard ( lan0 ). After about 1 min all is ok.

# netstat -rn
Routing tables
Destination Gateway Flags Refs Interface Pmtu
127.0.0.1 127.0.0.1 UH 0 lo0 4136
192.168.20.146 192.168.20.146 UH 0 lan0 4136
192.168.20.147 192.168.20.147 UH 0 lan2 4136
192.168.20.128 192.168.20.146 U 2 lan0 1500
192.168.20.128 192.168.20.147 U 2 lan2 1500
127.0.0.0 127.0.0.1 U 0 lo0 0
default 192.168.20.129 UG 0 lan2 0

[RAC_1 · Accepted solution]

ndd -get /dev/tcp ip_ire_gw_probe

If it is 1, set it to 0

ndd -set /dev/tcp ip_ire_gw_probe 0
For ermanent setting, put it in /etc/rc.config.d/nddconf file.

ndd -h ip_ire_gw_probe for details.

About NTP, do you two ntp servers defined in /etc/ntp.conf??

Anil

[Jerry L. Sims]

# ndd -get /dev/tcp ip_ire_gw_probe
1

grep -v "#" /etc/ntp.conf
server XXX.XXX.193.200

[RAC_1]

ndd -set /dev/tcp ip_ire_gw_probe 0

May be NTP is experiencing problem when gateway probe fails.

Set ip_ire_gw_probe to 0 and check for any errors. (For permanent setting, you can put it in /etc/rc.config.d/nddconf file)

Anil

[Sanjay_6]

Hi Jerry,

Looks like you have two network cards on the same system within the same subnet.

192.168.20.146 192.168.20.146 UH 0 lan0 4136
192.168.20.147 192.168.20.147 UH 0 lan2 4136

HP-UX does not support multiple lan cards on the same system within the same subnet. You must have different lan cards on different subnets. Having multiple lan cards on the same subnet could be causing this problem.

Hope this helps.

Regds