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

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

Post by Edward D. Brown » Sun, 19 Nov 2000 04:00:00



Hi,

    I'm connecting to one ISP (T-Online) via isdn/ipppd, which

seems to work fine.  But when I try to go to my other ISP (where

my mail is) I get the seemingly contradictory result that I can

ping it just fine, but when I try to telnet to it, it says "no

route to host".  I can think of no explanation for this (and

certainly no fix.  Here's the evidence:

bison% traceroute 194.95.220.131
traceroute to 194.95.220.131 (194.95.220.131), 30 hops max, 40 byte packets
 1  212.185.250.117 (212.185.250.117)  22 ms  20 ms  20 ms
 2  193.158.137.206 (193.158.137.206)  20 ms  20 ms  20 ms
 3  M-ag2.M.net.DTAG.DE (194.25.7.213)  30 ms  30 ms  30 ms
 4  M-gw13.M.net.DTAG.DE (212.185.10.210)  30 ms  30 ms  30 ms
 5  L-gw12.L.net.DTAG.DE (193.159.159.9)  30 ms  30 ms  30 ms
 6  L-gw13.L.net.DTAG.DE (62.156.140.86)  30 ms  30 ms  30 ms
 7  S-gw12.S.net.DTAG.DE (193.159.159.113)  40 ms  38 ms  40 ms
 8  S-gw13.S.net.DTAG.DE (212.185.11.3)  40 ms  40 ms  40 ms
 9  ir-stuttgart1.g-win.dfn.de (188.1.54.1)  40 ms  40 ms  40 ms
10  * * ir-stuttgart1.g-win.dfn.de (188.1.54.1)  32 ms !H
bison% ifconfig ippp1
ippp1     Link encap:Point-to-Point Protocol
          inet addr:62.156.3.51  P-t-P:212.185.250.117  Mask:255.0.0.0
          UP POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1
          RX packets:882 errors:0 dropped:0 overruns:0 frame:0
          TX packets:941 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:30

bison% netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
212.0.0.0       *               255.0.0.0       U         0 0          0 ippp1
default         212.185.250.117 0.0.0.0         UG        0 0          0 ippp1
bison% telnet 194.95.220.131
Trying 194.95.220.131...
telnet: connect to address 194.95.220.131: No route to host
bison%

I have a good default route (ping has no trouble).  Is someone blocking

me (if so, why doesn't it say that.)  Any plausible explanation would be

welcome, a solution for it would be fabulous :-)

Thanks - Ed

--

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

Post by Dual » Sun, 19 Nov 2000 04:00:00




Quote:>Hi,

>    I'm connecting to one ISP (T-Online) via isdn/ipppd, which

>seems to work fine.  But when I try to go to my other ISP (where

>my mail is) I get the seemingly contradictory result that I can

>ping it just fine, but when I try to telnet to it, it says "no

>route to host".

Seems to me like your ISP is blocking telnet traffic.

I guess they should secure their own servers by disabling telnet , and
let the port through

DualIP

 
 
 

1. ping -g 'gateway-IP' 'host-IP' DOESN'T work!

Hello guys,

I have a machine with two interfaces, each connected to
a gateway. This two gateways are then connected to a common
network and I want to ping another router in that network over
the two interfaces.

Looks like this:
                        Gateway 1
                           ----
               ------------|  |------------
              | Subnet A   ----            |
            ----
Machine    |  |                Subnet C   Router
            ----
              | Subnet B   ----            |
               ------------|  |------------
                           ----
                        Gateway 2

Now if I type following on my machine it doesn't work:

ping -g 'IP in Subnet A of Gateway 1' 'Router-IP-address'

But if I do a ping (Defaultgateway is 'IP in Subnet A of Gateway 1'
(without -g) it works fine:

ping 'Router-IP-address'

Can someone give me a hint? Thanks in advance!

Cheers, Walter

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