ping delay (packet loss) between HP-UX (11.11) and Windows

[Rosicky]

Hi,

We have a HP-UX 11.11 ( 10.61.X.X  ) machine which was recently migrated from one location to another.

There is a packet loss between the Unix server and one windows machine in the same subnet ( 10.61.X.X )

The ping has a delay of exactly 20 seconds.

# ping gsauXXXXX
PING gsauXXXXX: 64 byte packets
64 bytes from 10.61.x.X: icmp_seq=0. time=0. ms
64 bytes from 10.61.x.X: icmp_seq=58. time=0. ms
64 bytes from 10.61.x.X: icmp_seq=78. time=0. ms
64 bytes from 10.61.x.X: icmp_seq=161. time=0. ms
64 bytes from 10.61.x.X: icmp_seq=181. time=0. ms

The windows box is present in the Unix server's host file

There is only one NIC on the HP-UX server.

I have tried removing all the entries in the resolv.conf and manually add a songle name server but no luck.

The ping sometimes works fine when we stop start the network /sbin/init.de/net start

Can someone point me in the right direction.

lanadmin -g output :

LAN INTERFACE STATUS DISPLAY
Tue , Jan 9,2018 21:27:56

PPA Number = 0
Description = lan0 HP PCI 1000Base-T Release B.11.11.15
Type (value) = ethernet-csmacd(6)
MTU Size = 1500
Speed = 1000000000
Station Address = 0xXXXX
Administration Status (value) = up(1)
Operation Status (value) = up(1)
Last Change = 2869
Inbound Octets = 1404468091
Inbound Unicast Packets = 912069368
Inbound Non-Unicast Packets = 10098528
Inbound Discards = 0
Inbound Errors = 0
Inbound Unknown Protocols = 3385
Outbound Octets = 2314685677
Outbound Unicast Packets = 852506077
Outbound Non-Unicast Packets = 68876
Outbound Discards = 0
Outbound Errors = 0
Outbound Queue Length = 0
Specific = 655367

Ethernet-like Statistics Group

Index = 1
Alignment Errors = 0
FCS Errors = 0
Single Collision Frames = 0
Multiple Collision Frames = 0
Deferred Transmissions = 0
Late Collisions = 0
Excessive Collisions = 0
Internal MAC Transmit Errors = 0
Carrier Sense Errors = 0
Frames Too Long = 0
Internal MAC Receive Errors = 0

# cat /etc/nsswitch.conf
#
# /etc/nsswitch.files:
#
# @(#)B.11.11_LR
#
# An example file that could be copied over to /etc/nsswitch.conf; it
# does not use any name services.
#
passwd: files winbind ldap
group: files winbind ldap
#passwd: files
#group: files ldap
hosts: files dns ldap
services: files ldap
networks: files ldap
protocols: files ldap
rpc: files ldap
publickey: files
netgroup: files ldap
automount: files
aliases: files

[Steven Schweda]

> We have a HP-UX 11.11 ( 10.61.X.X  ) machine which was recently
> migrated from one location to another.

   Are you talking about a move to the next room, or to the other side
of the world, or what?  How much network hardware changed?  Do all the
systems have the same IP addresses as before?

> The ping has a delay of exactly 20 seconds.

   I don't know what that means.  "delay" between what and what?

> # ping gsauXXXXX

   "gsauXXXX" is the Windows system?

> [...]
> 64 bytes from 10.61.x.X: icmp_seq=58. time=0. ms
> [...]

   You seem to have a serious network problem.  Whether HP-UX is
involved is not clear.  What have you done to test the hardware?  What
happens if you replace this HP-UX system with some convenient PC (or
anything, with the same IP address and other parameters)?

> I have tried removing all the entries in the resolv.conf and manually
> add a songle name server but no luck.

   Assuming that "10.61.x.X" is the expected address, then I don't see
how DNS could be your problem.

   Why hide your private (10.61.*.*) IP addresses?  You seem to be
making more work for yourself with no gain in return.

[Rosicky]

Thank you for your response. 

The HPUX system has been migrated from one city in AUstralia to another

The machine was moved physically from one datacentre to another
The network hardware is same.

The IP address has changed

> Are you talking about a move to the next room, or to the other side
of the world, or what? How much network hardware changed? Do all the
systems have the same IP addresses as before?

> The ping has a delay of exactly 20 seconds.

I don't know what that means. "delay" between what and what?

The ping delay between the hpux server and the windows machine ("gsauXXXX" )

The reverse ping ( from Windows to HPUX) works fine

> # ping gsauXXXXX

"gsauXXXX" is the Windows system?

"gsauXXXX" is the Windows system !

> [...]
> 64 bytes from 10.61.x.X: icmp_seq=58. time=0. ms
> [...]

You seem to have a serious network problem. Whether HP-UX is
involved is not clear. What have you done to test the hardware? What
happens if you replace this HP-UX system with some convenient PC (or
anything, with the same IP address and other parameters)?

this is a production server. The only problem is the packet loss which happens when we try to ping the windows server.

The reverse ping ( from Windows to HPUX) works fine

> I have tried removing all the entries in the resolv.conf and manually
> add a songle name server but no luck.

Assuming that "10.61.x.X" is the expected address, then I don't see
how DNS could be your problem.

Why hide your private (10.61.*.*) IP addresses? You seem to be
making more work for yourself with no gain in return.

10.61.1.122  is the windows server

10.61.1.120 HPUX server