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Two systems does not communicate with each other . Connectivity is fine with all o

hpuxadm1
Occasional Advisor

Two systems does not communicate with each other . Connectivity is fine with all o

Hello All ,

I am facing a strange network problem with two HPUX systems. Those 2 systems does not connect to each other. Both are on the same network . These machines connects to all other systems in network but does not only connect to each other.
System A is physical server & System B is IVM guest. Network Details are as below :-

Routing information System A :-

netstat -nrv
Routing tables
Dest/Netmask Gateway Flags Refs Interface Pmtu
127.0.0.1/255.255.255.255 127.0.0.1 UH 0 lo0 4136
10.238.22.135/255.255.255.255 10.238.22.135 UH 0 lan2:1 4136
10.238.22.123/255.255.255.255 10.238.22.123 UH 0 lan2 4136
192.9.255.54/255.255.255.255 192.9.255.54 UH 0 lan0 4136
10.238.22.0/255.255.254.0 10.238.22.123 U 3 lan2 1500
10.238.22.0/255.255.254.0 10.238.22.135 U 3 lan2:1 1500
192.9.252.0/255.255.252.0 192.9.255.54 U 2 lan0 1500
127.0.0.0/255.0.0.0 127.0.0.1 U 0 lo0 4136
default/0.0.0.0 10.238.23.254 UG 0 lan2 1500


netstat -in
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
lan2 1500 10.238.22.0 10.238.22.123 483529713 0 399422295 0 0
lan0 1500 192.9.252.0 192.9.255.54 430774937 0 842010363 0 0
lo0 4136 127.0.0.0 127.0.0.1 4470844 0 4470935 0 0
lan2:1 1500 10.238.22.0 10.238.22.135 6856518 0 6856407 0 0

Routing information System A :-
Routing tables
Dest/Netmask Gateway Flags Refs Interface Pmtu
127.0.0.1/255.255.255.255 127.0.0.1 UH 0 lo0 32808
10.238.23.53/255.255.255.255 10.238.23.53 UH 0 lan1 32808
192.9.255.24/255.255.255.255 192.9.255.24 UH 0 lan0 32808
10.238.22.123/255.255.255.255 10.238.23.53 UH 0 lan1 0
10.238.22.0/255.255.254.0 10.238.23.53 U 2 lan1 1500
192.9.252.0/255.255.252.0 192.9.255.24 U 2 lan0 1500
127.0.0.0/255.0.0.0 127.0.0.1 U 0 lo0 32808
default/0.0.0.0 10.238.23.254 UG 0 lan1 1500

netstat -in
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
lan1 1500 10.238.22.0 10.238.23.53 3687139 0 731409 0 0
lan0 1500 192.9.252.0 192.9.255.24 3970190 0 58381 0 0
lo0 32808 127.0.0.0 127.0.0.1 121469 0 121469 0 0

These systems communicates properly to all other systems except each other.
can anyone suggest some sloution ?

Regards,
5 REPLIES
hpuxadm1
Occasional Advisor

Re: Two systems does not communicate with each other . Connectivity is fine with all o

Hi All.
I have observed one more thing.
If I down & up interface of IVM guest , it works for some time . But after some time approx 30-40 minutes , I again face the same problem.

sarfaraj ahmad
Trusted Contributor

Re: Two systems does not communicate with each other . Connectivity is fine with all o

Hi,

Is there any ping drop/latency between these two machines?
hpuxadm1
Occasional Advisor

Re: Two systems does not communicate with each other . Connectivity is fine with all o

System does not ping each other.
Jose Mosquera
Honored Contributor

Re: Two systems does not communicate with each other . Connectivity is fine with all o

Hi,

This happens using names or IP addresses?

In the case of you are using names, do you have configured at least /etc/resolv.conf and /etc/nsswitch.conf files?

Rgds.
Shibin_2
Honored Contributor

Re: Two systems does not communicate with each other . Connectivity is fine with all o

Looking at your routing table on System B ( assuming you tried to say it as system B ), following entry doesn't point to any mtu.

10.238.22.123/255.255.255.255 10.238.23.53 UH 0 lan1 0

Can you correct this ? May be you remove it.
Regards
Shibin