As the Tunnel device has no real inherrent MRU limit,

so don't enforce the MTU as an MRU. Allow bidirectional ppp MTU
negotiation, by checking against a differnt figure for MRU.
Make it large enough for ATM frames at least.

Submitted by:   archie@whistle.com (archie cobbs)

1 files changed, 4 insertions, 1 deletions

diff --git a/sys/net/if_tun.h b/sys/net/if_tun.h
index 404a8773971e..6c44fcdc75ae 100644
--- a/sys/net/if_tun.h
+++ b/sys/net/if_tun.h
@@ -38,9 +38,12 @@ struct tun_softc {
 	struct	selinfo	tun_wsel;	/* write select (not used) */
 };
 
-/* Default maximum packet size */
+/* Maximum transmit packet size (default) */
 #define	TUNMTU		1500
 
+/* Maximum receive packet size (hard limit) */
+#define	TUNMRU		16384
+
 struct tuninfo {
 	int	baudrate;		/* linespeed */
 	short	mtu;			/* maximum transmission unit */