Assuming that by 'two networks' you mean two IP subnets, not just two
physical networks, you can use a linux machine with 3 network cards. One
to the router, and one to each subnet.

[Linux]<->[Router]<->[Internet]
 |   |
 | [Subnet-A]
 |
[Subnet-B]


The only static routes would be in the linux pointing a default route to
the router, and in the router pointing routes for both subnets to the
linux.

The machines on the subnets would use the appropriate interface of the
linux machine as default gateway.


"calin@gmx" wrote:
...
>         Data :
>             - there are two networks
>             - a bunch of switches in a tree-like structure
>             - one router for Internet acces
>         Request :
>             - I want to install a machine with linux as a firewall
> between router and LAN.
>         Suggestion needed for configuring static routes. Also feel
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