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intercept the ip address of a telnet session
Post 84564 by paololrp on Tuesday 27th of September 2005 07:33:00 AM
09-27-2005
intercept the ip address of a telnet session
The situation:
a Unix system (UnixWare 7.1.3) to which are connected other systems;
various p.c. on the LAN that they connect Unix to the system via TelNet.
The problem:
I need to intercept the address IP of the p.cs. connected via telnet to the Unix system.
Particularly, I have to know the address of the specific p.c., immediately after it has completed the login so that to be able to redirect some elaborations on its shared resources.
This use, obviously, has to be already operating in the shell, immediately after having made login.
I have tried to see between the various commands and file of system, but I have not succeeded in understanding as the system it associates a host to its ip address.
With the command "netstat - n - p tcp" I succeed at the most in knowing what systems are conversing by tcp-ip, but the problem is that this command not me from specific information for the p.c. from which I am performing the session telnet.
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Original message (Italian):
Situazione:
un sistema Unix (UnixWare 7.1.3) a cui si collegano vari altri sistemi;
vari p.c. in rete locale che si collegano al sistema Unix via TelNet.
Problema:
ho bisogno di intercettare l'indirizzo IP dei p.c. che si collegano al sistema Unix.
In particolare, devo conoscere l'indirizzo del p.c. specifico, subito dopo che ha completato il login, in modo da poter reindirizzare alcune elaborazioni sulle sue risorse condivise.
Questo utilizzo, ovviamente, deve essere funzionante già nella shell, subito dopo aver fatto login.
Ho provato a vedere tra i vari comandi e file di sistema, ma non sono riuscito a capire come il sistema associa un host al suo indirizzo ip.
Con il comando "netstat -n -p tcp" riesco al massimo a sapere quali sistemi stanno dialogando in tcp-ip, ma il problema è che questo comando non mi da informazioni specifiche per il p.c. da cui sto eseguendo la sessione telnet.
a Unix system (UnixWare 7.1.3) to which are connected other systems;
various p.c. on the LAN that they connect Unix to the system via TelNet.
The problem:
I need to intercept the address IP of the p.cs. connected via telnet to the Unix system.
Particularly, I have to know the address of the specific p.c., immediately after it has completed the login so that to be able to redirect some elaborations on its shared resources.
This use, obviously, has to be already operating in the shell, immediately after having made login.
I have tried to see between the various commands and file of system, but I have not succeeded in understanding as the system it associates a host to its ip address.
With the command "netstat - n - p tcp" I succeed at the most in knowing what systems are conversing by tcp-ip, but the problem is that this command not me from specific information for the p.c. from which I am performing the session telnet.
---
Original message (Italian):
Situazione:
un sistema Unix (UnixWare 7.1.3) a cui si collegano vari altri sistemi;
vari p.c. in rete locale che si collegano al sistema Unix via TelNet.
Problema:
ho bisogno di intercettare l'indirizzo IP dei p.c. che si collegano al sistema Unix.
In particolare, devo conoscere l'indirizzo del p.c. specifico, subito dopo che ha completato il login, in modo da poter reindirizzare alcune elaborazioni sulle sue risorse condivise.
Questo utilizzo, ovviamente, deve essere funzionante già nella shell, subito dopo aver fatto login.
Ho provato a vedere tra i vari comandi e file di sistema, ma non sono riuscito a capire come il sistema associa un host al suo indirizzo ip.
Con il comando "netstat -n -p tcp" riesco al massimo a sapere quali sistemi stanno dialogando in tcp-ip, ma il problema è che questo comando non mi da informazioni specifiche per il p.c. da cui sto eseguendo la sessione telnet.
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LEARN ABOUT DEBIAN
arpspoof
ARPSPOOF(8) System Manager's Manual ARPSPOOF(8) NAME
arpspoof - intercept packets on a switched LAN SYNOPSIS
arpspoof [-i interface] [-c own|host|both] [-t target] [-r] host DESCRIPTION
arpspoof redirects packets from a target host (or all hosts) on the LAN intended for another host on the LAN by forging ARP replies. This is an extremely effective way of sniffing traffic on a switch. Kernel IP forwarding (or a userland program which accomplishes the same, e.g. fragrouter(8)) must be turned on ahead of time. OPTIONS
-i interface Specify the interface to use. -c own|host|both Specify which hardware address t use when restoring the arp configuration; while cleaning up, packets can be send with the own address as well as with the address of the host. Sending packets with a fake hw address can disrupt connectivity with certain switch/ap/bridge configurations, however it works more reliably than using the own address, which is the default way arpspoof cleans up afterwards. -t target Specify a particular host to ARP poison (if not specified, all hosts on the LAN). Repeat to specify multiple hosts. -r Poison both hosts (host and target) to capture traffic in both directions. (only valid in conjuntion with -t) host Specify the host you wish to intercept packets for (usually the local gateway). SEE ALSO
dsniff(8), fragrouter(8) AUTHOR
Dug Song <dugsong@monkey.org> ARPSPOOF(8)