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The ERL supports offloading for various protocols and features. I'm pretty sure IPv6 offload is disabled by default, at least for older firmware versions. Not sure about IPv4 or other protocols. Having offload disabled would have a huge effect on performance.

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Both the ERL and ERX have hardware NAT offloading as of 1.8.5 (current firmware is 1.9.0), but the ERL also has ipsec offloading.

https://www.reddit.com/r/Ubiquiti/comments/4owurp/erl_vs_erx...

Just a random note... there are very limited site-to-site scenarios where the IPSec offload will actually kick in. I wasn't able to get offload working for any kind of remote access scenario, meaning it's not usable as a VPN (unaccellerated strong crypto on the MIPS is < 10 Mbps)

Ubiquity would absolutely own this router space if they made a follow up to the ERL with fully offloaded IPSec for stronger crypto.

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