rsh taking 7 min to respond???? please help

[Davor Pavisic]

Hi all,

I have an RS6000 running AIX v 5.1.... I have installed gnu cvs
1.11.7 and I would like to use the RS6000 as my cvs repository. The
repository will serve 4 other unix machines, mainly linux
workstations running red hat 7.3

My problem is the following: to verify rsh connectivity between my
linux machines and the aix, according to the cvs manual, I should try

rsh -l username my.machine.com 'echo $PATH'

The problem is that any rsh command to my aix takes an awfully long
time... regardless of where the machines are.... they are in the same
local network and ping response is ok.... see below

I timed the rsh command as below:

[dp@Mars dp]$ time rsh -l dp 10.2.3.61 'echo $PATH'
/usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/usr/java130/jre/bin:/usr/java130/bin

real 7m30.154s
user 0m0.000s
sys 0m0.010s

SEVEN MINUTES!!!!!!

These are the results of the ping command

[dp@Mars dp]$ ping 10.2.3.61
PING 10.2.3.61 (10.2.3.61) from 10.2.3.68 : 56(84) bytes of data.
Warning: time of day goes back, taking countermeasures.
64 bytes from 10.2.3.61: icmp_seq=0 ttl=255 time=508 usec
64 bytes from 10.2.3.61: icmp_seq=1 ttl=255 time=257 usec
64 bytes from 10.2.3.61: icmp_seq=2 ttl=255 time=271 usec

--- 10.2.3.61 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max/mdev = 0.257/0.345/0.508/0.116 ms

any ideas... please help

dp

[Doug Freyburger]

Davor Pavisic wrote:

>
> I timed the rsh command as below:
>
> [dp@Mars dp]$ time rsh -l dp 10.2.3.61 'echo $PATH'
> /usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/usr/java130/jre/bin:/usr/java130/bin
>
> real 7m30.154s
> user 0m0.000s
> sys 0m0.010s
>
> SEVEN MINUTES!!!!!!

Nearly all delay issues with RSH are DNS related. It does a reverse
lookup from the source IP address then checks ~/.rhosts and /etc/hosts.equiv
If your DNS is poorly configured like worng IP numbers in /etc/resolv.conf
it will take 30 seconds each. Also 30 second delays can happen at the DNS
server level doing timeouts across firewalls.

> These are the results of the ping command
>
> [dp@Mars dp]$ ping 10.2.3.61
> PING 10.2.3.61 (10.2.3.61) from 10.2.3.68 : 56(84) bytes of data.
> Warning: time of day goes back, taking countermeasures.
> 64 bytes from 10.2.3.61: icmp_seq=0 ttl=255 time=508 usec

Bad time of day is not promising. Looks like you need to go over your
target machine carefully.

[Davor Pavisic]

Thanx for the advice..... you were right.... we made some changes in
our network and I forgot to reconfigure my DNS on that machine (opss).
I am still having problems but my response time is down to 15
secs.!!!

thanx

[email]dfreybur@yahoo.com[/email] (Doug Freyburger) wrote in message

> Nearly all delay issues with RSH are DNS related. It does a reverse
> lookup from the source IP address then checks ~/.rhosts and /etc/hosts.equiv
> If your DNS is poorly configured like worng IP numbers in /etc/resolv.conf
> it will take 30 seconds each. Also 30 second delays can happen at the DNS
> server level doing timeouts across firewalls.
>

> Bad time of day is not promising. Looks like you need to go over your
> target machine carefully.