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--- documentation:examples:gre_ipsec_and_openvpn [2020/09/14 21:57] – [Router 4] olivier
+++ documentation:examples:gre_ipsec_and_openvpn [2020/09/15 16:21] – [Router 2] olivier
@@ Line 250: / Line 250: @@
 service routing restart
 config save
+</code>
+Take care of avoiding fragmentation, TCP-MSS should be reduced on a gif using inet6, like with this pf.conf example:
+<code>
+[root@VM2]~# cat /etc/pf.conf
+set skip on lo0
+scrub on gif1 inet all max-mss 1200
+scrub on gif1 inet6 all max-mss 1180
+pass
 </code>
 ==== Router 4 ====