Re: Problems with IP address change
On 11/23/05, John covici <covici@ccs.covici.com> wrote:
> This is sort of a shot in the dark, but in our router config it may
> mention the address somewhere -- do you have any static nat's i.e ip
> nat static ... for port forwarding?
>From what I remember, I am using source nat'ing.
But I am using port forwarding.
Both of those reference eth0, not the ip address.
> Hope this helps.
>
> on Wednesday 11/23/2005 Grant Thomas(eldowan.debian@gmail.com) wrote
> > Hello all, and thanks for any help in advance.
> >
> > The problem I am having today is dealing with changing the external IP
> > address of a router / firewall.
> >
> > To change the IP address, I edited the /etc/network/interfaces file,
> > and changed the address from xx.xx.97.99 to xx.xx.97.100
> > Then I ran the following:
> > ifdown eth0
> > ifup eth0
> > ifconfig
> >
> > ifconfig shows the correct address of xx.xx.97.100
> >
> > I thought all was well.
> > When I go to any site, the address is still reported as xx.xx.97.99
> > I have tried rebooting the machine, but to no avail.
> >
> > A little background would be helpful.
> >
> > This machine is a firewall / router, used for a network of about 30 users.
> > The firewall is iptables, and is runnint tc for traffice control.
> > The machine is also the dhcp and dns server.
> >
> > The external interface, eth0, is connected by ethernet to a T1.
> > The T1 is accessed through a Cisco router.
> >
> > In addition to this, something else happened on an ip address change,
> > after the reboot.
> >
> > I changed the address from 97.99 to 97.100, and the machine would see
> > its gateway, 97.97.
> > It would not pass any packets past that however.
> > Once I changed the address back to 97.99 packets started passing no
> > problem, and I didn't reboot the machine either.
> >
> > Now, if I change the ip address back to 97.100, the internal network
> > can access the internet with no problem, but the router has extrememly
> > high latency pinging, etc.
> >
> > Thinking it could be an ARP problem, I also restarted the Cisco
> > router, but to no avail.
> >
> > I have checked the iptables configuration, as well as the tc
> > configuration. Neither of these files references the specific 97.99
> > address, refering to the port as eth0 instead.
> >
> >
> >
> > Any help would be greatly appreciated.
> > Thank you all so much.
> >
>
> --
> Your life is like a penny. You're going to lose it. The question is:
> How do
> you spend it?
>
> John Covici
> covici@ccs.covici.com
>
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