Hi all,

I have a Draytek 2830 setup with 3 x Subnets on Port based VLAN as follows

1.) 10.0.11.0/24
2.) 172.23.136.0/24
3.) 10.44.156.0/22

We have a x.x.x.134/29 IP Block from our ISP and we're using x.x.x.134 as the main Router IP and for NAT from subnet 1, I've assigned IP x.x.x.133 as a WAN Alias and we're using this as the IP for NAT on subnet 2. (subnet 3 does not use the draytek as it's default gateway, it's just on the network to allow routing between an organisation in the same building, traffic from this subnet to the WAN is blocked).

When setting the above up using the route policies in the menu - Inter-LAN routing between subnets 1 and 2 breaks and I'm not sure why. (I've not tested between 2 and 3, and routing between 1 and 3 is not needed).

On investigating, running a ping/traceroute from subnet 2 to subnet 1 fails with a reply from our upstream ISP gateway (x.x.x.67), so the Draytek is routing these packets to the upstream gateway and I'm not sure why. The routing table looks correct to me:

Key: C - connected, S - static, R - RIP, * - default, ~ - private
* 0.0.0.0/ 0.0.0.0 via x.x.x.67 WAN1
C~ 10.0.11.0/ 255.255.255.0 directly connected LAN1
C~ 10.44.156.0/ 255.255.252.0 directly connected LAN3
* x.x.x.67/ 255.255.255.255 via x.x.x.67 WAN1
S x.x.x.134/ 255.255.255.255 via x.x.x.134 WAN1
C~ 172.23.136.0/ 255.255.255.0 directly connected LAN2

Any help is greatly appreciated, thanks.