[FROG] OSPF over GRE over IPSec

[Volodymyr Litovka]

David,

thank you!

Brilliant, it's working :)

On 11.03.2022 18:53, David Lamparter wrote:
> On Fri, Mar 11, 2022 at 05:46:32PM +0100, Volodymyr Litovka wrote:
>> # tcpdump -i gre1 -v
>> [ ... ]
>> 15:34:49.132222 IP (tos 0xc0, ttl 1, id 15017, offset 0, flags [none], proto OSPF (89), length 68)
> ...
>
>> 6: gre1 at NONE: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1400 qdisc noqueue state UNKNOWN group default qlen 1000
>>       link/gre x.x.x.x peer x.x.x.y
>>       inet 100.99.0.66/30 brd 100.99.0.67 scope global gre1
>>          valid_lft forever preferred_lft forever
> You probably have "ttl inherit" set on the tunnel (it is the default).
> Since the TTL on the OSPF multicast packets is 1, the tunnel packets
> will not arrive at the destination.  Try:
> "ip link set gre1 type gre ttl 64"
>
> -David

-- 
Volodymyr Litovka
   "Vision without Execution is Hallucination." -- Thomas Edison
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