Vlan's routing

Ali27 · ‎02-16-2018

Hi !

I have an issue on my catalyst 3750

My vlans can't access to the internet, but the inter-vlan routing is ok..

I have a default routeur (zyxel vmg1312-b10a) who is addressed with 192.168.1.254

vlan 1 (default) interface : 192.168.1.10/24

Vlan 10 interface : 172.26.10.254/24

vlan 20 interface : 172.26.20.254/24

vlan 30 interface : 172.26.30.254/24

I can ping the interface where the default router is plug (192.168.1.15) on gi1/0/23

I can ping the interface of vlan

I can ping everything in fact, except the default router and obviously i can't ping 8.8.8.8..

I have a static ip route 0.0.0.0 0.0.0.0 192.168.1.254

When i realized a tracert with vlan 20 (172.26.20.18 to 192.168.1.254) there is an issue.

Tracing route to 192.168.1.254

1) 172.26.20.254 (interface of vlan 20)

2) * * * Requested timed out

Thanks in advance

Seb Rupik · ‎02-16-2018

Hi there,

The Zyxel router does not know how to reach the VLAN10,20,30 subnets. You will need to install a static route n the Zyxel directing traffic destined to those subnets via 192.168.1.10 .

This will allow you users to reach the Zyxel inside interface. Your next challenge will be to make the internet reachable to hosts in VLAN10,20,30 . By default the Zyxel will NAT for 192.168.1.10/24, but not the other subnets. You will need to add them to the NAT ACL....assuming it supports it.

cheers,

Seb.

Ali27 · ‎02-16-2018

ok, i'll connect to the zyxel first, and i will try different things