Quantum Spark 1800 SNAT

PolRA — Wed, 05 Nov 2025 08:56:57 GMT

Hi,

I have a Quantum Spark 1800 (SW 1800 Appliance R81.10.15 (996003913)) device that I need to configure multiple SNATs on.
When I turn it off:
Outgoing Traffic. Hide internal networks behind the gateway's external IP address.

The default SNAT through "This Gateway" stops working for me (I have Dynamic PPPoE on my WAN IP address).
If I add SNAT2:

Original Source - NET_Office (network)
Translated Source - IP_SC (IP modem)
Enable - Hide multiple sources behind the translated source addresses

Then SNAT2 works, but SNAT through "This Gateway" (Internet) doesn't.

What can I do to solve this issue, use multiple SNAT rules?

Thanks for help

Pol

Re: Quantum Spark 1800 SNAT

Lesley — Thu, 06 Nov 2025 20:22:40 GMT

NAT rule 5 does not make sense to me.

All traffic from NET towards This gateway is NOT being NATTED. The comment states it should be a NAT rule for internet

NAT rule 4 looks a bit more like a NAT rule towards internet.

If you have dynamic IP you can try the 0.0.0.0 object (bit oldschool)

https://community.checkpoint.com/t5/SMB-Gateways-Spark/Hide-NAT-using-quot-Interface-quot-object/m-p/153559#M7133

topic Re: Quantum Spark 1800 SNAT in General Topics

Quantum Spark 1800 SNAT

Re: Quantum Spark 1800 SNAT