configure three gateways addresses on one port of router

[black.robber]

hi everyone is there any one would like to help me

i got following situation

how to share router one fastethernet port (e.g fa0/0) with different network addresses(e.g 192.168.1.1 and 192.168.2.1 and 192.168.3.1) when using them as a gateway using RIP or static routing?

any one please help me..

[sean_evershed · Accepted solution]

Hi, See below a link for configuring a router on a stick.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/336-cisco-router-8021q-router-stick.html

Don't forget to rate all posts that are helpful.

Cheers

Sean

[black.robber]

thanks Sean.

i have another question related to the same situtation.

with the help of router on stick all the vlan can ping eathother.

     but what if i dont want them to ping eachther but still they can ping outside the network..?

[blau grana]

Hello Muhammad,

With router on a stick you will create three subinterfaces on router, on each of this subinterface you have to apply ACL which will deny local communication and allow communication to internet.

In your case:

ip access-list extended LAN_ACL

deny ip 192.168.0.0 0.0.255.255 192.168.0.0 0.0.255.255

permit ip 192.168.0.0 0.0.255.255 any

int Fa0/0.1

ip access-group LAN_ACL in

int Fa0/0.2

ip access-group LAN_ACL in

int Fa0/0.2

ip access-group LAN_ACL in

Best Regards

Please rate all helpful posts and close solved questions

[black.robber]

thanks blau grana

but sorry to say that does not work, by implementing above commands no pinging inside the network as well as outside the network..

[blau grana]

Can you please post output of these command:

#show ip int brief

#show ip route

#show ip access LAN_ACL

Best Regards

Please rate all helpful posts and close solved questions

[black.robber]

Router#show ip int brief

Interface              IP-Address      OK? Method Status                Protocol

FastEthernet0/0        unassigned      YES unset  up                    up

FastEthernet0/0.10     192.168.1.254   YES manual up                    up

FastEthernet0/0.20     192.168.2.254   YES manual up                    up

FastEthernet0/0.30     192.168.3.254   YES manual up                    up

FastEthernet0/1        unassigned      YES unset  administratively down down

Serial0/2/0            200.1.1.1       YES manual up                    up

Serial0/2/1            unassigned      YES unset  administratively down down

Vlan1                  unassigned      YES unset  administratively down down

Router#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

C    192.168.1.0/24 is directly connected, FastEthernet0/0.10

C    192.168.2.0/24 is directly connected, FastEthernet0/0.20

C    192.168.3.0/24 is directly connected, FastEthernet0/0.30

R    192.168.4.0/24 [120/2] via 200.1.1.2, 00:00:21, Serial0/2/0

C    200.1.1.0/24 is directly connected, Serial0/2/0

R    200.1.2.0/24 [120/1] via 200.1.1.2, 00:00:21, Serial0/2/0

R    200.1.3.0/24 [120/1] via 200.1.1.2, 00:00:21, Serial0/2/0

Router#show ip access LAN_ACL
Extended IP access list LAN_ACL
deny ip 192.168.0.0 0.0.255.255 192.168.0.0 0.0.255.255 (3 match(es))
permit ip 192.168.0.0 0.0.255.255 any

[blau grana]

Everything looks OK. Problem will be that you will be not able to reach 192.168.4.0 network, because this network is known via WAN interface [RIP route] and ACL wil deny this communication. Other networks 200.1.2.0/24 and 200.1.3.0/24 should be accessible.

Can you confirm this?

Best Regards

Please rate all helpful posts and close solved questions

[black.robber]

yes they are well and fine .. my ACL needs changes now