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ip/6in4: request ipv4 packets only in ipmux filter

--- a/sys/src/cmd/ip/6in4.c

+++ b/sys/src/cmd/ip/6in4.c

@@ -149,7 +149,7 @@

 	/*

 	 * gain access to IPv6-in-IPv4 packets via ipmux

 	 */

-	p = seprint(buf, buf + sizeof buf, "%s/ipmux!proto=%2.2x|%2.2x;dst=%V",

+	p = seprint(buf, buf + sizeof buf, "%s/ipmux!ver=4;proto=%2.2x|%2.2x;dst=%V",

 		outside, IP_IPV6PROTO, IP_ICMPV6PROTO, myip + IPv4off);

 	if (!anysender)

 		seprint(p, buf + sizeof buf, ";src=%V", remote4 + IPv4off);