Cisco Systems quick config for 2610 t-1 router to netgear firewall?

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quick config for 2610 t-1 router to netgear firewall? brandon.vogel@gmail.com 02-06-09
Posted by brandon.vogel@gmail.com on February 6, 2009, 4:28 pm
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Trying to figure out the right config to route all data coming from my
T-1 (built in CSU in 2610) out the ethernet port into the netgear
firewall router's 'Internet' port, and vice versa. I'm going to be
doing multi NAT (most machines on one IP, some others have their own)
on the Netgear, and just need the Cisco to simply push all traffic
from Internet to / from the Netgear. Easy, right? Trying to figure
out the right IP scheme / router config. Any ideas?

Posted by Doug McIntyre on February 6, 2009, 5:40 pm
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>Trying to figure out the right config to route all data coming from my
>T-1 (built in CSU in 2610) out the ethernet port into the netgear
>firewall router's 'Internet' port, and vice versa. I'm going to be
>doing multi NAT (most machines on one IP, some others have their own)
>on the Netgear, and just need the Cisco to simply push all traffic
>from Internet to / from the Netgear. Easy, right? Trying to figure
>out the right IP scheme / router config. Any ideas?

The cisco routes by default, which means you would either have to have
real IPs on the LAN side beyond the WAN side (ie. your service
provider routes you down another /30 for the cisco and netgear to talk),
or you can NAT everything behind the cisco, and then NAT again on the Netgear,
or you can bridge the data from interface to interface on the Cisco.
(ie. with IRB).

(kind of an odd link, but still works
http://www.cisco.com/en/US/docs/optical/15000r4_0/ethernet/454/guide/irb.pdf


Posted by brandon.vogel@gmail.com on February 6, 2009, 8:39 pm
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> >Trying to figure out the right config to route all data coming from my
> >T-1 (built in CSU in 2610) out the ethernet port into the netgear
> >firewall router's 'Internet' port, and vice versa. =A0I'm going to be
> >doing multi NAT (most machines on one IP, some others have their own)
> >on the Netgear, and just need the Cisco to simply push all traffic
> >from Internet to / from the Netgear. =A0Easy, right? =A0Trying to figure
> >out the right IP scheme / router config. =A0Any ideas?
>
> The cisco routes by default, which means you would either have to have
> real IPs on the LAN side beyond the WAN side (ie. your service
> provider routes you down another /30 for the cisco and netgear to talk),
> or you can NAT everything behind the cisco, and then NAT again on the Net=
gear,
> or you can bridge the data from interface to interface on the Cisco.
> (ie. with IRB).
>
> (kind of an odd link, but still workshttp://www.cisco.com/en/US/docs/opti=
cal/15000r4_0/ethernet/454/guide/...

Bridging sounds like what I would want to do, I just can't picture out
the IP config mentally. I currently have the Cisco router set up with
the firewall IOS, and am xfering the firewalling and NATting to the
netgear. At this point, it might be easier to just skip the Netgear
and do all my firewalling on the IOS firewall?

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