Weird, weird, weird issue ....

Weird, weird, weird issue ....

Post by Franci » Wed, 24 Apr 2002 12:42:38



Hi expert,
    I have this particular weird issue that is hitting some of my Sun
machine once in a while.

    The issue is I could not "rlogin", "ftp" to the machine, even though
I could "ping" the machine. When I did a "telnet" to that machine, then
everything else works.

    Have you come across this before ??

    How do I go about to trouble-shoot this ? Thanks.

Regards,
Francis.

 
 
 

Weird, weird, weird issue ....

Post by Martin Hepwort » Wed, 24 Apr 2002 17:59:40


Francis

Have you checked that forward AND reverse DNS lookup on the host in
question works?

--
Martin Hepworth
Senior Systems Administrator
Solid State Logic Ltd
+44 (0)1865 842300


> Hi expert,
>     I have this particular weird issue that is hitting some of my Sun
> machine once in a while.

>     The issue is I could not "rlogin", "ftp" to the machine, even though
> I could "ping" the machine. When I did a "telnet" to that machine, then
> everything else works.

>     Have you come across this before ??

>     How do I go about to trouble-shoot this ? Thanks.

> Regards,
> Francis.


 
 
 

Weird, weird, weird issue ....

Post by dave » Wed, 24 Apr 2002 21:24:34



> Hi expert,
>     I have this particular weird issue that is hitting some of my Sun
> machine once in a while.

>     The issue is I could not "rlogin", "ftp" to the machine, even though
> I could "ping" the machine. When I did a "telnet" to that machine, then
> everything else works.

>     Have you come across this before ??

>     How do I go about to trouble-shoot this ? Thanks.

> Regards,
> Francis.

inetd all gimped up?

--
--Dave
First do a google search, then do a groups.google.com search.   Then post
your question.  It'll save everyone time and you'll learn more.
///remove the REMOVEME to respond\\\

 
 
 

Weird, weird, weird issue ....

Post by Doug Freyubrg » Thu, 25 Apr 2002 06:51:17



>     The issue is I could not "rlogin", "ftp" to the machine, even though
> I could "ping" the machine. When I did a "telnet" to that machine, then
> everything else works.

It sounds like you try to login during a reboot.  For some time, the
machine was not respond to ping.  Then the machine responds to ping
but not to most interactive utilities.  Then they all work and you
can login.  Use uptime and you see the machine has only been up for
a minute.
 
 
 

Weird, weird, weird issue ....

Post by Bob Becke » Thu, 25 Apr 2002 06:53:39



Quote:>     I have this particular weird issue that is hitting some of
my Sun
> machine once in a while.
>     The issue is I could not "rlogin", "ftp" to the machine,
even though
> I could "ping" the machine. When I did a "telnet" to that
machine, then
> everything else works.

Are you saying that *after* you telnet successfully, then
rlogin and ftp, etc. all work?

Or do you mean the after you telnet to a machine you can
run ftp and rsh from that machine?

 
 
 

Weird, weird, weird issue ....

Post by Norm » Wed, 24 Apr 2002 13:25:48


You may want to check out the name services caching daemon.  I've seen many
instances where that will keep some remote service apps not work since they
can't grab the hostname from the cache for the name/ip resolution.

/etc/init.d/nscd stop
/etc/init.d/nscd start

Norman


> Hi expert,
>     I have this particular weird issue that is hitting some of my Sun
> machine once in a while.

>     The issue is I could not "rlogin", "ftp" to the machine, even though
> I could "ping" the machine. When I did a "telnet" to that machine, then
> everything else works.

>     Have you come across this before ??

>     How do I go about to trouble-shoot this ? Thanks.

> Regards,
> Francis.

 
 
 

Weird, weird, weird issue ....

Post by Doug Freyubrg » Fri, 26 Apr 2002 06:37:00



> You may want to check out the name services caching daemon.  I've seen many
> instances where that will keep some remote service apps not work since they
> can't grab the hostname from the cache for the name/ip resolution.

> /etc/init.d/nscd stop
> /etc/init.d/nscd start

If that works, it will fix the problem once.  So, try the below to fix it
for future times:

/etc/init.d/ncsd stop
mv /usr/sbin/ncsd /usr/sbin/ncsd.do.not.run

 
 
 

1. Weird Ping, weird FTP, weird Telnet... HELP!!!

Can anyone diagnose this for me?

I'm in the process of building up a firewall but at some stage I musta
messed up and am now getting really weird results.

This is the results of a ping from 192.168.0.1 to 192.168.0.1 (the box
which will become the fireawall).

# PING 192.168.0.1
PING 192.168.0.1 (192.168.0.1) from 192.168.0.1 : 56(84) bytes of
data.
64 bytes from 192.168.0.1: icmp_seq=0 ttl=225 time=0.7ms
64 bytes from 192.168.0.1: icmp_seq=1 ttl=225 time=80001.0ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=225 time=160000.9ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=225 time=240000.8ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=225 time=320000.8ms
64 bytes from 192.168.0.1: icmp_seq=5 ttl=225 time=400000.7ms
64 bytes from 192.168.0.1: icmp_seq=6 ttl=225 time=480000.7ms

^c

--- 192.168.0.1 ping statistics ---
509 packets transmitted, 8 packets received, 98% packet loss
round-trip min/avg/max = 0.7/280000.7/560000.6 ms

This also happens when I do it from other machines behind the firewall
but I was very surprised when it did it when pinging itself.

Theres a pattern of 80000ms increments between successful pings...
Can't figure out whats wrong though.

If I try to telnet or FTP, I have to wait for an eternity b4 the login
prompt appears after the initial "connected" msg. But once I login
there is no problem using the console or transferring files. Same
thing for other machines to 192.168.0.1. So the network is "working"
but its waiting for something.

Has anyone had this happen to them b4 and manage to solve it?

Any help appreciated

Regards,

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