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<p>David,</p>
<p>thank you!</p>
<p>Brilliant, it's working :)<br>
</p>
<div class="moz-cite-prefix">On 11.03.2022 18:53, David Lamparter
wrote:<br>
</div>
<blockquote type="cite" cite="mid:YiuMfND7tL6EKznA@eidolon.nox.tf">
<pre class="moz-quote-pre" wrap="">On Fri, Mar 11, 2022 at 05:46:32PM +0100, Volodymyr Litovka wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap=""># tcpdump -i gre1 -v
[ ... ]
15:34:49.132222 IP (tos 0xc0, ttl 1, id 15017, offset 0, flags [none], proto OSPF (89), length 68)
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
...
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">6: gre1@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
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
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
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</blockquote>
<pre class="moz-signature" cols="72">--
Volodymyr Litovka
"Vision without Execution is Hallucination." -- Thomas Edison</pre>
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