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Outbound access failing with new network

Longman
I have added an additional network attached to eth3 on the Sophos firewall with the following details:

HP2920 Switch
IP: 192.168.75.253
MASK: 255.255.255.0
DG: 192.168.75.254 (Sophos Eth3)

SOPHOS FIREWALL ETH3
IP: 192.168.75.254
MASK: 255.255.255.0
DG: 

Now what I expected is that a client with a default gateway of 192.168.75.253 should be able to get internet access, but it doesn't work

CLIENT (doesn't work - I see nothing in the firewall log)
IP: 192.168.75.1
MASK: 255.255.255.0
DG: 192.168.75.253 (HP2920 Switch)
Dns: 8.8.8.8

CLIENT (works)
IP: 192.168.75.1
MASK: 255.255.255.0
DG: 192.168.75.254 (Sophos Eth3)
Dns: 8.8.8.8

The resellers engineer is at a loss. I have tried a different switch with the same results. I am running version 9.309-3.


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Parents
  • 0
    Network diagrams?  Layers 2 and 3, please.

    Are you using the switch as a layer 3 router or only a layer 2 switch?   Your IPs, netmasks and functioning client suggest it is operating as a switch - but you want the switch to route?

    Network: 192.168.75.0/24
    Gateway: 192.168.75.254
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  • 0
    Network diagrams?  Layers 2 and 3, please.

    Are you using the switch as a layer 3 router or only a layer 2 switch?   Your IPs, netmasks and functioning client suggest it is operating as a switch - but you want the switch to route?

    Network: 192.168.75.0/24
    Gateway: 192.168.75.254
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