[strongSwan] IPSec between multiple hosts on subnet

Johannes Hubertz johannes at hubertz.de
Mon Mar 17 15:59:43 CET 2014


perhaps you like to think of transport mode?

Happy working

On 17.03.2014 14:24, Mick Mason wrote:
> Hi,
> I’m not a Linux bod so am out of my depth here, and am hoping someone can help.s

> If I had 4 servers running Strongswan (currently using 5.1.2 on Ubuntu) that were all on the same subnet, is there a way to specify that all communications between them should be secured with IPSec, without having to specify 3 distinct host-to-host connections in the ipsec.conf on every one of the servers, each with hardcoded IP’s in, each ipsec.conf different from the others?
> What would be ideal (don’t know if such a thing exists), is something like this:
> conn test
> 	type=tunnel
> 	auto=start
> 	left=<local IP goes here>
> 	right=<%any, a subnet range, a CIDR or other non-specific entry etc>
> 	authby=secret
> I could then create a script that changed the left IP for every new host, but could get away with this single configuration.
> Is anything like that possible?
> Thanks
> M
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Johannes Hubertz

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