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DHCP RELAY issue after upgrading to MR-8

AntonioCorsini1

Hi all,

just closed a ticket with Sophos Support.

There is a confirmed bug (NC-20755). After uprading to MR-8, DHCP relays do not work properly.

I have a configuration the several VLANS, and DHCP relay configured to serve dynamic IPs.

A temporarily workaround was to delete the DHCP relay, and configure a DHCP server instead. And it works.

Sophos Support connected to the firewall in SSH to fix the issue. The problem will be solved int V17 rev 1.

Beware that an upgrade to V17 will erase this fix, that theoretically has to be reapplied to V17 also (and it should work, but not sure at the moment). If not, a rollback from V17 to V16 need to erase totally the XG and restore configuration from a backup. Not so easy.

Best regards



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  • 0

    Antonio,

    Strange support told you that is was MR8 that caused it but I'm not supprised anymore. Sophos support is a joke. It broke in MR5, I opened a case, and was tracked as NC-19984. Our case is still open so we could track how long it takes Sophos to fix a core function. Opened June 19th. Support told me then it would not be fixed until V17 which I am worried to try. The workaround was to enable "Relay Through IPsec" which was found by another forum member, not even a Sophos engineer. We are on MR8 and have not made any changes to DHCP relay settings since the workaround we applied with MR5.

    Original post.

    https://community.sophos.com/products/xg-firewall/f/network-and-routing/93247/dhcp-relay-not-working-in-mr5

     

    Mike

  • 0 in reply to MichaelBolton

    Hi all,

    my situation is the following:

    - Customer 1: 2x XG310 (HA), actually MR-4. DHCP relay is working, and when I updated to Mr-8 it stopped working, and now fixed as described above.
    - Customer 2: 1x XG125 actually MR-7. Always promptly updated every time. DHCP relay working from MR-4 (maybe earlier). After updating to MR-8 it stopped working; revert to MR-7 restarted working well

    Both the configurations involves DHCP relay and VLAN.

    I don't know if NC-19984 and NC-20755 are related to the same problem.

    I tried also to configured VLAN on LAG interface (Customer 2) but seems that there are some other problems to fix, related to NC-10402 (quite old). Support says that also this one should be fixed into 17.1

    Regards

Reply
  • 0 in reply to MichaelBolton

    Hi all,

    my situation is the following:

    - Customer 1: 2x XG310 (HA), actually MR-4. DHCP relay is working, and when I updated to Mr-8 it stopped working, and now fixed as described above.
    - Customer 2: 1x XG125 actually MR-7. Always promptly updated every time. DHCP relay working from MR-4 (maybe earlier). After updating to MR-8 it stopped working; revert to MR-7 restarted working well

    Both the configurations involves DHCP relay and VLAN.

    I don't know if NC-19984 and NC-20755 are related to the same problem.

    I tried also to configured VLAN on LAG interface (Customer 2) but seems that there are some other problems to fix, related to NC-10402 (quite old). Support says that also this one should be fixed into 17.1

    Regards

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