Hi,

Jonas Lochmann wrote:
> I tried to use a stateful source address rewriting instead. With
> nftables, this is easy to implement and it works if the prefix length of
> the uplink is longer (smaller subnet) than the internal network: Just
> keep the prefix and replace the bits after it with the original source
> address. With this, I can use local addresses in the local network and
> additionally provide the public address/es of one or more uplinks.
> I am using this in production at one location since multiple years and
> thus know that this works. I am interested in other approaches,
> experiences and feedback for this method.

Maria’s comment about BGP multihoming is correct and reasonable if you have one 
location/few locations and use access circuits that providers are willing to 
run BGP over.  It doesn’t help if you are trying to arrange low-cost resilient 
internet access over low cost FTTx/cellular to, say, hundreds or thousands of 
branch offices.  It’s one use-case for v4 NAT which, even this NAT denier, 
agrees works well.

Is your solution based on any published standard, Jonas, or has it been 
implemented as a feature on any commercial small router?

Best wishes,
Andy Davidson (AJBD-RIPE)
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