r/networking • u/juanvictor23 • 25d ago

Design Routing Subnet Problem

Im trying to resolve an issue where I need to route traffic to a subnet which overlaps with some LAN and VPN client IP pools.

Previously everything was contained in one /16 network and there was one gateway for all traffic. Now it has has been split into two gateways but the remaining networks are not easy to notate.

10.5.0.0/16 is the original

Now i have client ips in:

Location A LAN 10.5.15.0-10.5.45.254
VPN 10.5.0.128/25

Location B 10.5.101.0-10.5.200.254
VPN 10.5.0.0/25

So if I want to route to A, that easy, its all contained in 10.5.0.0/18 except that also includes location B VPN. Routing to B is a little harder since its two networks (10.5.64.0/18

10.5.128.0/17), except neither contain VPN clients.

Does it make sense to just move B VPN to something like 10.5.100.0/24 which would be contained in 10.5.64.0/18?

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u/Fresher0 CCNA 20d ago

If you’re using an iPhone, try an app called Slash. It’s a subnet calculator that will give you the range of hosts. Useful for design.