cancel
Showing results for 
Search instead for 
Did you mean: 

exos behavior then ipforwarding is disabled

exos behavior then ipforwarding is disabled

Marius_Matijosi
New Contributor II
my config
VLAN 1 IP adress is set, no ipforwarding, default route is set - gw is from same subnet.
VLAN 2 IP address is set, no ipforwarding.

I need management access from VLAN 2 subnet. Ex. there is Netsight in same VLAN/Subnet.
VLAN 1 should be used for connection to Radius.

in my case there is no need for ipforwarding between these two VLANs in the switch..

How does EXOS switch forward packets if there are two IPs set (in two VLANS) and ipforwarding is not enabled on both Vlans?
How does EXOS switch forward packets if there are two IPs set (in two VLANS) and ipforwarding is enabled for one VLAN only?

Could you advise how to configure switch for my scenario.
Thanks
3 REPLIES 3

Marius_Matijosi
New Contributor II
Thanks. It makes sense.

simon_bingham
New Contributor II
I tested this years ago ( and wrote down the results ) Excuse my scrappy visio

Conclusion

If ip forwarding is disabled the router will

NOT forward onto vlan that is disabled

NOT forward FROM the vlan that is disabled,

The slight is exception is if the router OWNs the ipaddress it will always respond

But any for any other addresses on the subnet ie not owned by the router itselfs traffic will not be forwarded

f2e4de16fdfb4a28931037db419adfa8_RackMultipart20161108-28117-d5xb8c-test_inline.jpg

Wow....this is seriously impressive organization, note taking and recall Simon.

Appreciate you sharing with the Hub so others can take advantage of your good work in the future.
GTM-P2G8KFN