Ethereal-users: Re: [Ethereal-users] BPF filters

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From: Jaap Keuter <jaap.keuter@xxxxxxxxx>
Date: Wed, 21 Dec 2005 20:50:48 +0100 (CET)

On Wed, 21 Dec 2005 candidcalm@xxxxxxxxx wrote:

> Can someone please tell me how to use the capture filter
> gateway host
>
> or some example using the primitive "gateway".
>
> I know an alternative would be something like "ether host 11:22:33:44:55:66
> and not host 192.168.77.2", but would like to know how to make it working
> with the keyword gateway.
>
> (I am using ethereal on a windows machine.)

>From the WinPcap site:
------8<-------
gateway host
    True if the packet used host as a gateway. I.e., the ethernet source
or destination address was host but neither the IP source nor the IP
destination was host. Host must be a name and must be found both by the
machine's host-name-to-IP-address resolution mechanisms (host name file,
DNS, NIS, etc.) and by the machine's host-name-to-Ethernet-address
resolution mechanism (/etc/ethers, etc.). (An equivalent expression is

        ether host ehost and not host host

    which can be used with either names or numbers for host / ehost.) This
syntax does not work in IPv6-enabled configuration at this moment.
------8<-------

I think the devil is in the fact that 'host' in 'gateway host' needs to be
a name.

Good luck,
Jaap