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Routing on sub interfaces

Ivan Martinez

How's it going !!

Currently we have configured a Vlan with sub interfaces as in the example:

That is, it is required that the network of the 172.82.11.0/24 segment has an exit through the gateway 172.82.11.1, however it goes through the default segment 172.82.1.1



How could we make this requirement work?


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  • 0

    Hello,

    show us the routing table.

    Which IP is communicating to which other IP?

    Directly attached networks should be able to communicate to each other if this is allowed by a policy. All other traffic is usually routed through the default gateway if the is no other routing entry or SD-WAN rule. 

    And yes you should also consider the routing precedence.

    Regards,
    BeEf

  • 0

    i be sure, the clients from the network of the 172.82.11.0/24 segment leave their subnet though 172.82.11.1.
    I am sure too you configure this IP as "gateway" within the clients.
    But after packets hitting their subnet-gateway, they reach the internal routing process and these process send the packet to the next hop not trough the interface back to this subnet. (i think the gef.GW for the Firewall is within 172.82.1.xx Range?)
    Which IP the packet should reach next after it leaves the firewall?
    i would recommend:
    1. split the different L3-subnets to multiple l2-Vlans.
    2. post a short network sketch


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

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