Christoph Biedl wrote...

So, assuming this is the cause here, the fix is pretty simple:

(...)

+#ifdef INET6
if (if6_is_up)
sif6down(0);
+#endif

This was silently done as part of

commit 80b8744eb42c7493794f3e3fe0bf1ce14f53e6dd
Author: Eivind Næss <eivnaes@yahoo.com>
Date: Fri Aug 6 09:14:02 2021 -0700

Changing INET6 to PPP_WITH_IPV6CP and adding configure option

http://git.ozlabs.org/?p=ppp.git;a=blobdiff;f=pppd/sys-linux.c;h=94e5a19ed4c67cc44f97b2257c3b0d57b4ed15a0;hp=0ffc4277b2aa4b661fae8faac27ca450596f6599;hb=80b8744;hpb=a6622771e2dc03a2682c86c4bcf6bf6ae9e85df7

Christoph


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