                                 EtherApe FAQ

     * Why I see only the traffic to/from the EtherApe machine ?
       Probably  you  have  a  switched network.  Unless all traffic goes
       thru  the  etherape  machine  (or  you have an hub), etherape sees
       local traffic.
       Etherape  can  "see"  only  the  traffic physically passing on the
       netcard wire. Many small network use hubs to connect computers, so
       every packet is physically transmitted to every netcard.
       A  larger  network  use  combinations  of  switches  and  routers,
       sometimes  even  firewalls  to connect nodes, so your network card
       receives only its own traffic or broadcast.
       To  monitor  an entire network you can enable analisys/roving mode
       on  your switch (essentially copies all traffic to a single port).
       If  you  have multiple switches, or routers, or the total bandwith
       exceeds  the  port  maximum,  you  still will see only part of the
       traffic.
       If you only want to monitor internet traffic, a better solution is
       to place etherape on the (internal) internet gateway.
     * How can I see the detail dialogs ?
       Double click on a node or link opens the corrisponding dialog.
     * Why is one computer constantly changing names?
       You are running in ethernet mode. Switch to IP mode.
     * Why can I only see computers on my own network?
       See question above
     * I can't see any text, just little squares. What gives?
       Go  to  preferences  and  change the text font. Make sure you save
       your changes
     * Is  it  possible  to  see  just  traffic  within my network? Is it
       possible to see just traffic to/from the internet?
       You  can indeed filter traffic. Have a look at the filter entry in
       preferences->capture->filter
       Suppose your network address starts with 213.227
       If  you  only  want  to  see traffic within your network, then the
       proper syntax is
       ip and src net 213.227 and dst net 213.227
       Or  if  you  want  to see connections to/from outside your network
       then try something like
       ip  and  ((not  src  net 213.227) and dst net 213.227) or (src net
       213.227 and (not dst net 213.227))
     * What's the format for /etc/ethers?
       Just pairs of Ethernet addresses and names, like
       00:40:33:35:80:5F LAZARO
       00:40:33:35:80:6D NEBAJ
       00:C0:26:A2:58:FE ARGOS
     * How do I find the ether address of an IP node?
       Here is an example:
       argos:~# ping lazaro
       PING lazaro.tattoine.es (192.168.1.1): 56 data bytes
       64 bytes from 192.168.1.1: icmp_seq=0 ttl=255 time=1.8 ms
       round-trip min/avg/max = 1.6/1.7/1.8 ms
       argos:~# arp lazaro
       Address HWtype HWaddress Iface
       lazaro.tattoine.es ether 00:40:33:35:80:5F eth0
       Of course, you can only do this for nodes in your network.
     * How do I find the IP corresponding to an ether address?
       You could, for instance, use
       argos:~# tcpdump -f "ether src 00:40:33:35:80:5F" -n
       tcpdump: listening on eth0
       10:34:11.116930    192.168.1.1.7002    >    192.168.1.2.1031:    P
       76753564:76753576(12)
       There you have it, the IP src is 192.168.1.1
     * Hosts keep moving because they come and go... What can I do?
       Set node timeout to 0.
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   $Id: FAQ.html,v 1.16 2006/04/16 10:56:57 bchiara Exp $

   [1]sourceforge

References

   1. http://sourceforge.net/
