--- pppd/ipv6cp.c
+++ pppd/ipv6cp.c
@@ -245,6 +245,8 @@
 
     { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local,
       "Accept peer's interface identifier for us", 1 },
+    { "ipv6cp-accept-remote", o_bool, &ipv6cp_allowoptions[0].accept_remote,
+      "Accept peer's interface identifier for itself", 1 },
 
     { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
       "Use (default) IPv4 address as interface identifier", 1 },
@@ -435,6 +437,7 @@
     memset(ao, 0, sizeof(*ao));
 
     wo->accept_local = 1;
+    wo->accept_remote = 1;
     wo->neg_ifaceid = 1;
     ao->neg_ifaceid = 1;
 
@@ -960,7 +963,7 @@
 		orc = CONFREJ;		/* Reject CI */
 		break;
 	    }
-	    if (!eui64_iszero(wo->hisid) && 
+	    if (!eui64_iszero(wo->hisid) && !wo->accept_remote &&
 		!eui64_equals(ifaceid, wo->hisid) && 
 		eui64_iszero(go->hisid)) {
 		    
--- pppd/ipv6cp.h
+++ pppd/ipv6cp.h
@@ -150,7 +150,8 @@
 typedef struct ipv6cp_options {
     int neg_ifaceid;		/* Negotiate interface identifier? */
     int req_ifaceid;		/* Ask peer to send interface identifier? */
-    int accept_local;		/* accept peer's value for iface id? */
+    int accept_local;		/* accept peer's value for our iface id? */
+    int accept_remote;		/* accept peer's value for his iface id? */
     int opt_local;		/* ourtoken set by option */
     int opt_remote;		/* histoken set by option */
     int use_ip;			/* use IP as interface identifier */
--- pppd/pppd.8
+++ pppd/pppd.8
@@ -463,6 +463,11 @@
 interface identifier, even if the local IPv6 interface identifier
 was specified in an option.
 .TP
+.B ipv6cp\-accept\-remote
+With this option, pppd will accept the peer's idea of its (remote)
+IPv6 interface identifier, even if the remote IPv6 interface
+identifier was specified in an option.
+.TP
 .B ipv6cp\-max\-configure \fIn
 Set the maximum number of IPv6CP configure-request transmissions to
 \fIn\fR (default 10).