Comcast static IPs through router

Comcast static IPs through router

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Subject Author Date
Comcast static IPs through router duncan 01-15-2007
Posted by duncan on January 15, 2007, 6:06 pm
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I have 5 static IPs from Comcast through an SMC 8013WG cable modem. I
need to route 4 of these IPs to static IPs on my LAN. What do I need in
the way of hardware/software? One of the 5 WAN IPs goes directly to my
mail server.


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Posted by glen herrmannsfeldt on January 15, 2007, 6:50 pm
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duncan wrote:
> I have 5 static IPs from Comcast through an SMC 8013WG cable modem. I
> need to route 4 of these IPs to static IPs on my LAN. What do I need in
> the way of hardware/software? One of the 5 WAN IPs goes directly to my
> mail server.

First, this is an IP question, not an ethernet question.

I usually use FreeBSD, or some other free unix-like system
for a router. (A 486 is fast enough, though a pentium
would probably be more reasonable these days.)
I don't believe that most SOHO routers include
this ability, though it isn't hard to do.

As I understand it the Linksys WRT54G is one that people use to
load linux on, in which case it might be that you could do it.

-- glen


Posted by John Gray on January 15, 2007, 10:25 pm
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> duncan wrote:
>> I have 5 static IPs from Comcast through an SMC 8013WG cable modem. I
>> need to route 4 of these IPs to static IPs on my LAN. What do I need in
>> the way of hardware/software? One of the 5 WAN IPs goes directly to my
>> mail server.
>
> First, this is an IP question, not an ethernet question.
>
> I usually use FreeBSD, or some other free unix-like system
> for a router. (A 486 is fast enough, though a pentium
> would probably be more reasonable these days.)
> I don't believe that most SOHO routers include
> this ability, though it isn't hard to do.
>
> As I understand it the Linksys WRT54G is one that people use to
> load linux on, in which case it might be that you could do it.
>
> -- glen
>
>

The WRT54G permits only one WAN IP, AFAIK. The latest WRT54G version is no
longer using Linux, but older ones are. The WRT54GS is still available
with Linux firmware.

There is several 3rd party firmware for the linux based versions, but I
don't know if they add this capability.


Posted by glen herrmannsfeldt on January 16, 2007, 1:03 am
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John Gray wrote:
(snip)

> The WRT54G permits only one WAN IP, AFAIK. The latest WRT54G version is no
> longer using Linux, but older ones are. The WRT54GS is still available
> with Linux firmware.

Sorry, I meant loading linux on it downloading to flash, not the
software it comes with (which may also be Linux).

> There is several 3rd party firmware for the linux based versions, but I
> don't know if they add this capability.

I don't know either, but it is common in linux NAT software, so I
would be surprised if there was one that would.

-- glen


Posted by Jeff Jonas on January 18, 2007, 6:19 am
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>
>> duncan wrote:
>>> I have 5 static IPs from Comcast through an SMC 8013WG cable modem. I
>>> need to route 4 of these IPs to static IPs on my LAN. What do I need in
>>> the way of hardware/software? One of the 5 WAN IPs goes directly to my
>>> mail server.

My U.S. Robotics USR 5462 SoHo (4 port switch with 802.11g)
allows mapping 8 WAN addresses to LAN (internal/local) addresses.
I'm unsure the "DMZ" option will work
since that might not pass thru the WAN address.
Sadly, that model is already at "end of life",
the last firmware update being Sept 2004.

I'm unsure what other SoHo NAT/switches have that option.
My equipment is already several years old.
--

-- mejeep deMeep ferret!

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