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Routing, The Challenge

L0stB0y
Code:

Hi,



For experts, my trouble is:





Today, I have a CLASS C:



                 +-------+

INTERNET  a.b.c.1/24

                 +-------+



I Wanna split into 3 subnets:



a.b.c.0/26

a.b.c.64/26

a.b.c.128/25



                 +-------+                           +-----+

INTERNET  a.b.c.1/26  a.b.c.64/26

                 +-------+                           +-----+

                                                        |

                                                        e2

                                                        v

                                                    a.b.c.128/25



I need to route "a.b.c.64/26" and "a.b.c.128/25" using ASL box



is possible?



[]s

L0stB0y



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  • 0
    in case we are talking about official ips, you'll have to add two routing lines for a.b.c.64/26 and a.b.c.128/25 on the cisco ... (route them to the asl ip addr. in a.b.c.0/26)

    /marcel 
  • 0 in reply to Marcel_01
    Code:

    OK, let me try understand


                     +-------+                         +-----+
    INTERNET  a.b.c.64/26
                     +-------+                         +-----+
                                                            |
                                                            +--- e2 (4) --> a.b.c.128/25

    where ethernet interface is:

    1 - a.b.c.1/26   - CISCO PORT e0
    2 - a.b.c.2/25   - ASL PORT e0
    3 - a.b.c.65/26  - ASL PORT e1
    4 - a.b.c.129/25 - ASL PORT e3

    a need add in my router

    ip route a.b.c.64  255.255.255.192 a.b.c.2
    ip route a.b.c.128 255.255.255.128 a.b.c.2

    but i need change anything in ASL BOX? please if possible write a "cook book" for me

      
  • 0 in reply to L0stB0y
    1) the cisco will have a route to put your class C directly on the ethernet. edit it by just making the netmask smaller (26)
    2) on the cisco add 2 more routes for the other new networks to the ASL external IP (.2).
    3) on the ASL, configure interfaces as normal (you got the IPs right [:)]P).
    4) Have fun with your class  C (NAT sucks), but remember that you need to put more care into the packetfilter than the usual NAT-crippled firewall ! [:)]

    /tom
     
  • 0 in reply to tom_01
    Tom,

    I'm testing your suggestions and all running ok, but i have more any questions:

    1) I can have 2 networks in same ethernet interface?
    2) What type rules a need to protect my networks?