Ping works - Telnet doesn't

Ping works - Telnet doesn't

Post by Bill Honeycutt » Fri, 02 Feb 2001 18:21:32



Hello,

I'm baffled by a laptop running RedHat 7 with a Ricochet 28.8 packet
modem.

I connect to the Ricochet network, I can ping other hosts, but when I
try to telnet I get:

   Trying 63.203.71.xxx...
   Connected to my.otherhost.net.
   Escape character is '^]'.

...but I never get to the login prompt...

   Red Hat Linux release 7.0 (Guinness)
   Kernel 2.2.16-22 on an i686
   login:

What would cause the laptop to block TCP inbound packets and yet let
ICMP packets (i.e. ping) through?  BTW, ipchains is set to allow
everything through.

Anyone have a suggestion?

Thanks in advance,

Bill

 
 
 

Ping works - Telnet doesn't

Post by Natanael Cop » Fri, 02 Feb 2001 16:27:55



> Hello,

> I'm baffled by a laptop running RedHat 7 with a Ricochet 28.8 packet
> modem.

> I connect to the Ricochet network, I can ping other hosts, but when I
> try to telnet I get:

>    Trying 63.203.71.xxx...
>    Connected to my.otherhost.net.
>    Escape character is '^]'.

> ...but I never get to the login prompt...

>    Red Hat Linux release 7.0 (Guinness)
>    Kernel 2.2.16-22 on an i686
>    login:

> What would cause the laptop to block TCP inbound packets and yet let
> ICMP packets (i.e. ping) through?  BTW, ipchains is set to allow
> everything through.

> Anyone have a suggestion?

> Thanks in advance,

> Bill

Is the reverse name lookup working for your laptop? If not there will be a
delay before it connects (but if you wait it will connect). You can set up
your laptop IP address in 63.203.71.xxx's /etc/hosts.

Is the telnet port open on 63.203.71.xxx? check int the /etc/inetd.conf

 
 
 

Ping works - Telnet doesn't

Post by Bill Honeycutt » Fri, 02 Feb 2001 19:59:50




> > Hello,

> > I'm baffled by a laptop running RedHat 7 with a Ricochet 28.8 packet
> > modem.

> > I connect to the Ricochet network, I can ping other hosts, but when I
> > try to telnet I get:

> >    Trying 63.203.71.xxx...
> >    Connected to my.otherhost.net.
> >    Escape character is '^]'.

> > ...but I never get to the login prompt...

> >    Red Hat Linux release 7.0 (Guinness)
> >    Kernel 2.2.16-22 on an i686
> >    login:

> > What would cause the laptop to block TCP inbound packets and yet let
> > ICMP packets (i.e. ping) through?  BTW, ipchains is set to allow
> > everything through.

> > Anyone have a suggestion?

> > Thanks in advance,

> > Bill

> Is the reverse name lookup working for your laptop? If not there will be a
> delay before it connects (but if you wait it will connect). You can set up
> your laptop IP address in 63.203.71.xxx's /etc/hosts.

> Is the telnet port open on 63.203.71.xxx? check int the /etc/inetd.conf

Natanael, even if I include the 63.203.71.xxx host IP in hosts, I get
the same result.  Also, I am able to boot this laptop under RH 5.0,
connect and login with telnet to the host in question.

Is it possible to look at netstat output and diagnose this further?
Perhaps see if certain packets are being striped out?

Thanks for your insight!

 
 
 

Ping works - Telnet doesn't

Post by Goffredo MORVILL » Fri, 02 Feb 2001 20:14:32


But i think is that:

/etc/passwd
...
nomeutente:500:100:/home/nomeutente/./:/bin/false
...

instead of

nomeutente:500:100:/home/nomeutente/./:/bin/bash




> > Hello,

> > I'm baffled by a laptop running RedHat 7 with a Ricochet 28.8 packet
> > modem.

> > I connect to the Ricochet network, I can ping other hosts, but when I
> > try to telnet I get:

> >    Trying 63.203.71.xxx...
> >    Connected to my.otherhost.net.
> >    Escape character is '^]'.

> > ...but I never get to the login prompt...

> >    Red Hat Linux release 7.0 (Guinness)
> >    Kernel 2.2.16-22 on an i686
> >    login:

> > What would cause the laptop to block TCP inbound packets and yet let
> > ICMP packets (i.e. ping) through?  BTW, ipchains is set to allow
> > everything through.

> > Anyone have a suggestion?

> > Thanks in advance,

> > Bill

> Is the reverse name lookup working for your laptop? If not there will be a
> delay before it connects (but if you wait it will connect). You can set up
> your laptop IP address in 63.203.71.xxx's /etc/hosts.

> Is the telnet port open on 63.203.71.xxx? check int the /etc/inetd.conf

 
 
 

Ping works - Telnet doesn't

Post by David K. Mean » Sun, 04 Feb 2001 06:53:21



Quote:> Hello,

> I'm baffled by a laptop running RedHat 7 with a Ricochet 28.8 packet
> modem.

> I connect to the Ricochet network, I can ping other hosts, but when I
> try to telnet I get:

>    Trying 63.203.71.xxx...
>    Connected to my.otherhost.net.
>    Escape character is '^]'.

> ...but I never get to the login prompt...

>    Red Hat Linux release 7.0 (Guinness)
>    Kernel 2.2.16-22 on an i686
>    login:

> What would cause the laptop to block TCP inbound packets and yet let
> ICMP packets (i.e. ping) through?  BTW, ipchains is set to allow
> everything through.

> Anyone have a suggestion?

You can try
  # tcpdump -i ppp0
and get a listing of all the packets (headers) that leave and arrive
on that port.  This might shed some light.
 
 
 

1. On a Linux router, ftp& telnet works but ping doesn't work .

Hi all

I am setting up a Linux router with a Redhat 6.2 machine (But it has a
specially made Linux 2.4 kernel) with two Intel Pro/100+ cards. The
card at eth0 has an ip address of 192.168.150.177 and it is connect to
a switch with subnet 192.168.150.160/27. The eth1 card
(192.168.150.193) is connected to a hub and this network has the
subnet of 192.168.150.192/28. A host machine with an Intel Pro/100+
card and an ip address of 192.168.150.194 is also connected to the
hub. From the router machine, I can ping and telnet into the
192.168.150.194 host machine. However, I cannot ping from the
192.168.150.194 machine to the router(192.168.150.193). But oddly, I
can ftp and telent????? Have anyone experienced this problems before.
Also, both machine connecting to the hub are connect to the regular
port (No uplink). Thank you

Peter

2. USR5637 USB modem setup (2)

3. 'ping' sees route but 'telnet' doesn't??

4. help with term

5. Ping works, telnet doesn't

6. Socks 5 Proxy

7. Ping works but telnet doesn't

8. kerneld and awe64 questions

9. ping works, telnet doesn't

10. Ping works - Telnet doesn't!

11. ping works but telnet doesn't

12. ping works, telnet doesn't ??

13. Ping works but telnet doesn't? HELP!!!!!!