This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

same subnet on multiple interfaces

One of our ISP's has given us a second internet connection. Eventually the existing connection will go away. For testing, they assigned the new service the same /24 as the existing connection. They assigned an address from that block to the customer interface on their new router (we confirmed the address was available).

I connected the new router to a spare port on my UTM and assigned it the same subnet as the existing connection. I did not yet set a default gw. When I enable that interface, the UTM stops routing external traffic completely. Apparently having two interfaces with the same subnet (although physically separate) confuses it?

Is there a way I get the UTM to recognize this new WAN before disconnecting the existing one?

This thread was automatically locked due to age.

Parents

0 alehman over 11 years ago

Thanks for the quick response.

I assigned a GW for the new interface pointing to the customer port on the new access router (it automatically added to uplink balancing. I set priority to 0). The GW for the existing interface is the customer port on that router.

Same result - When I enable the interface, all internet traffic stops.

What are you using for the single GW?
Cancel
Vote Up 0 Vote Down

Cancel

Reply

0 alehman over 11 years ago

Thanks for the quick response.

I assigned a GW for the new interface pointing to the customer port on the new access router (it automatically added to uplink balancing. I set priority to 0). The GW for the existing interface is the customer port on that router.

Same result - When I enable the interface, all internet traffic stops.

What are you using for the single GW?
Cancel
Vote Up 0 Vote Down

Cancel

Children

No Data

same subnet on multiple interfaces

Submitted a Tech Support Case lately from the Support Portal?