I think it is helpful to tell the user what happens if the remote
endpoint doesn't support RFC 4638.

OK?

 - todd

Index: share/man/man4/pppoe.4
===================================================================
RCS file: /cvs/src/share/man/man4/pppoe.4,v
retrieving revision 1.34
diff -u -p -u -r1.34 pppoe.4
--- share/man/man4/pppoe.4      16 Jun 2017 10:58:43 -0000      1.34
+++ share/man/man4/pppoe.4      16 Mar 2021 12:05:40 -0000
@@ -201,6 +201,14 @@ With this, the previously mentioned MSS 
 .Xr pf.conf 5
 are no longer necessary.
 .Pp
+If you attemp to use an MTU larger than 1492 where the remote equipment does
+.Em not
+support RFC 4638,
+.Nm
+will write
+.Dq No valid PPP-Max-Payload tag received in PADO
+to the kernel message buffer and the MTU will be clamped to 1492.
+.Pp
 See
 .Xr pf.conf 5
 for more information on MTU, MSS, and NAT.

Reply via email to