Hello...
I have the following problem:
The usual way for a linux router to manage connections between 2 or more
internet providers and an internal network is to SNAT the internal network into
the (usually 1) external ip address that the provider has given us. My problem
is that i dont wish to do SNAT (anymore) because my provider has given my a
unique internet ip address for each pc so that my the internet address and local
are identical. My SNAT configuration worked perfectly. I had two routing tables
1)Main
231.245.21.0/27 dev eth2 scope link
192.168.1.0/24 dev eth0 scope link
192.168.2.0/24 dev eth1 scope link
default via 192.168.1.1 dev eth0
2)Policy
231.245.21.0/27 dev eth2 scope link
192.168.1.0/24 dev eth0 scope link
192.168.2.0/24 dev eth1 scope link
default via 231.245.21.1 dev eth2
Where 192.168.2.0 is my internal network, 231.245.21.0 the network of Provider 1
and 192.168.1.0 the network of Provider 2.It all worked (almost) flawlessly.
Certain Ports were going out from eth2 while all the other from eth0.
One would say that with the internet ips i would have to make the following
change: (Asuming that pc''s at lan have 231.245.21.4-62 from now on)
1)Main
231.245.21.0/27 dev eth2 scope link
231.245.21.0/27 dev eth0 scope link
192.168.1.0/24 dev eth1 scope link
default via 192.168.1.1 dev eth2
and
2)Policy
231.245.21.0/27 dev eth2 scope link
231.245.21.0/27 dev eth0 scope link
192.168.1.0/24 dev eth1 scope link
default via 231.245.21.1 dev eth2
But alas, when i tried to do that it was not accepted:
"RTNETLINK : File exists" <--- exit output
I tried to do it with the route command and it was accepted only for main table
but look what was happening. If i had the first declaration of the subnet
in eth2 I could only communicate with the gateway 1 (231.245.21.1) while if it
was eth0 in the first declaration I couldn'' t communicate with the gw
but only with lan. Then I tried another way. Instead of declaring the same
network I declared a static route only with the gateway in eth2. Thus :
1)Main
231.245.21.1 dev eth2 scope link
231.245.21.0/27 dev eth0 scope link
192.168.1.0/24 dev eth1 scope link
default via 192.168.1.1 dev eth1
2)Policy
231.245.21.1 dev eth2 scope link
231.245.21.0/27 dev eth0 scope link
192.168.1.0/24 dev eth1 scope link
default via 231.245.21.1 dev eth2
And in that way i managed into the point that i could communicate from my linux
router with both sides. I mean Provider 1 and internal network. I could also
communicate from my local lan with provider 2. But the real problem is that i
cannot communicate with Provider 1 from my local lan. Is this the right way to
accomplish that and i am missing something or is it the tottally wrong way to do
it. Someone plz help.
Thank you in advance
