Issue with point to point VPNs behind NAT and asymmetric traffic
Grant Taylor
gtaylor at tnetconsulting.net
Sat Jun 15 21:34:47 UTC 2019
On 6/15/19 2:06 PM, William Herrin wrote:
> This is probably enabled on one or both ends:
>
> http://tldp.org/HOWTO/Adv-Routing-HOWTO/lartc.kernel.rpf.html
Do some distros enable this now?
I thought it was disabled by default.
> Disable it.
Or make sure it's using loose (2) filtering.
rp_filter - INTEGER
0 - No source validation.
1 - Strict mode as defined in RFC3704 Strict Reverse Path Each incoming
packet is tested against the FIB and if the interface is not the best
reverse path the packet check will fail. By default failed packets are
discarded.
2 - Loose mode as defined in RFC3704 Loose Reverse Path Each incoming
packet's source address is also tested against the FIB and if the source
address is not reachable via any interface the packet check will fail.
--
Grant. . . .
unix || die
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