Getting public IP address of NAT firewall
rasjidw at bigpond.com
Sun Feb 10 15:15:50 EST 2002
On Thu, 7 Feb 2002 11:28 pm, Rasjid Wilcox wrote:
> Suppose that I have a hardware fireall that does NAT and it is given a
> dynamic IP address by the ISP. Is there any way for a user of a
> workstation behind the firewall to find out the public IP address of the
> firewall without logging into the firewall?
> What I'm thinking is, is there any information kept in the TCP/IP headers
> that would allow me to do this, or is that all lost during the NAT/IP
> masquarade process?
The following seems to do what I want.
$ ping -c 1 -R www.webone.com.au | grep -C1 "RR:" | tail -n1
Thanks to all who replied.
PS. I'm sure there is a better way of saying 'the line after the one where
"RR:" appears', but it works.
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