Local IP not being local

Local IP not being local

[Miguel Manso]

Hi there,

I've a linux machine acting as a router. I'm VERY happy with it and I'm
learning a lot (iptables rocks).

Now, I've something strange that I don't know how to solve.

I've a static public IP, let's imagine - 100.100.100.1

All the requests to that IP are redirected to the internal ip - 192.168.1.6

Now, inside 192.168.1.6 if I ping 100.100.100.1 I get:

64 bytes from 100.100.100.1: icmp_seq=16 ttl=61 time=23.7 ms

But, if I ping 'localhost' I get:

64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=1 ttl=64 time=0.044
ms


This means that the ping that I'm doing to 100.100.100.1 is going to the
router, going to the outside, coming back to the router and to the internal
machine again.

Can I "say" something to the linux router to just redirect all the requests to
the 100.100.100.1 ip to the internal machine 192.168.1.6?

Thanks a lot for the help.

=====
Miguel Manso
mmanso@yahoo.com

__________________________________
Do you Yahoo!?
The New Yahoo! Search - Faster. Easier. Bingo.
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Re: Local IP not being local

[SaVaGE]

Op dinsdag 29 april 2003 03:27, schreef Miguel Manso:
> Hi there,
>
> I've a linux machine acting as a router. I'm VERY happy with it and I'm
> learning a lot (iptables rocks).
>
> Now, I've something strange that I don't know how to solve.
>
> I've a static public IP, let's imagine - 100.100.100.1
>
> All the requests to that IP are redirected to the internal ip - 192.168.1.6
>
> Now, inside 192.168.1.6 if I ping 100.100.100.1 I get:
>
> 64 bytes from 100.100.100.1: icmp_seq=16 ttl=61 time=23.7 ms
>
> But, if I ping 'localhost' I get:
>
> 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=1 ttl=64
> time=0.044 ms
>
>
> This means that the ping that I'm doing to 100.100.100.1 is going to the
> router, going to the outside, coming back to the router and to the internal
> machine again.
>
> Can I "say" something to the linux router to just redirect all the requests
> to the 100.100.100.1 ip to the internal machine 192.168.1.6?
>
> Thanks a lot for the help.
>
> =====
> Miguel Manso
> mmanso@yahoo.com
>
> __________________________________
> Do you Yahoo!?
> The New Yahoo! Search - Faster. Easier. Bingo.
> http://search.yahoo.com

My guess is, you have to alter your /etc/hosts file , cause when internal ip 
not is recognized ,then a query to the outside wil be made.

/etc/hosts

127.0.0.1		localhost.localdomain		localhost
192.168.1.6       yourname domain 		yourname 
100.100.100.1   yourname2domain		yourname2


Pascal (PC-Secure)