Outbound one-to-many NAT
SonicAdmin80 Cybersecurity Overlord ✭✭✭
I'd need to distribute outgoing connections to multiple WAN IPs in a round robin fashion but this doesn't seem to be possible as I receive the error: "Source translation few:many not supported"
Is there any workaround? This would be for sending email out over multiple WAN IPs to avoid throttling.
Category: Entry Level Firewalls
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@SonicAdmin80 don't kill me if it's not working, but did you tried Multipath-Routing for outbound SMTP traffic by creating a Default Route with Multiple Gateways? I don't have that at my disposal, but might worth a shot.
But I guess you followed this already:
I don't think that would work as that's routing over multiple interfaces or gateways, not utilizing multiple X1 IP addresses for outgoing traffic which would require NAT anyway.
The trouble is that Microsoft sometimes throttles my Email Security IP addresses. And If I recall, Email Security always uses the primary IP address for email delivery, so creating additional paths might not help. I would need to deploy additional analyzers just to load balance over multiple IPs.
@SonicAdmin80 I tried to trick the few-to-many by translating a whole network to multiple addresses (/24 translated to a group of 4 addresses), but the source always got translated to the same IP (out of the 4), so there was no load sharing over the pool, which would'nt help at all.