diff -urN ppp-2.4.4.orig/pppd/auth.c ppp-2.4.4/pppd/auth.c
--- ppp-2.4.4.orig/pppd/auth.c	Tue Jan  1 14:44:37 2008
+++ ppp-2.4.4/pppd/auth.c	Tue Jan  1 14:45:12 2008
@@ -647,8 +647,10 @@
     }
     if (!hungup)
 	lcp_lowerdown(0);
-    if (!doing_multilink && !demand)
+    if (!doing_multilink && !demand) {
 	script_unsetenv("IFNAME");
+        script_unsetenv("IFUNIT");
+    }
 
     /*
      * Run disconnector script, if requested.
diff -urN ppp-2.4.4.orig/pppd/main.c ppp-2.4.4/pppd/main.c
--- ppp-2.4.4.orig/pppd/main.c	Tue Jan  1 14:44:37 2008
+++ ppp-2.4.4/pppd/main.c	Tue Jan  1 14:45:12 2008
@@ -739,9 +739,14 @@
 set_ifunit(iskey)
     int iskey;
 {
-    info("Using interface %s%d", PPP_DRV_NAME, ifunit);
     slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
-    script_setenv("IFNAME", ifname, iskey);
+    info("Using interface %s", ifname);
+    script_setenv("IFUNIT", ifname, iskey);
+    if (req_ifname[0] && sys_change_ifname(ifname, req_ifname)) {
+       slprintf(ifname, sizeof(ifname), "%s", req_ifname);
+        info("Changing interface to %s", ifname);
+    }
+    script_setenv("IFNAME", ifname, 0);
     if (iskey) {
 	create_pidfile(getpid());	/* write pid to file */
 	create_linkpidfile(getpid());
diff -urN ppp-2.4.4.orig/pppd/multilink.c ppp-2.4.4/pppd/multilink.c
--- ppp-2.4.4.orig/pppd/multilink.c	Tue Jan  1 14:44:37 2008
+++ ppp-2.4.4/pppd/multilink.c	Tue Jan  1 14:45:12 2008
@@ -204,7 +204,7 @@
 			/* make sure the string is null-terminated */
 			rec.dptr[rec.dsize-1] = 0;
 			/* parse the interface number */
-			parse_num(rec.dptr, "IFNAME=ppp", &unit);
+			parse_num(rec.dptr, "IFUNIT=ppp", &unit);
 			/* check the pid value */
 			if (!parse_num(rec.dptr, "PPPD_PID=", &pppd_pid)
 			    || !process_exists(pppd_pid)
@@ -417,7 +417,7 @@
 	TDB_DATA kd, vd;
 	int ret = 0;
 
-	slprintf(ifkey, sizeof(ifkey), "IFNAME=ppp%d", unit);
+	slprintf(ifkey, sizeof(ifkey), "IFUNIT=ppp%d", unit);
 	kd.dptr = ifkey;
 	kd.dsize = strlen(ifkey);
 	vd = tdb_fetch(pppdb, kd);
diff -urN ppp-2.4.4.orig/pppd/options.c ppp-2.4.4/pppd/options.c
--- ppp-2.4.4.orig/pppd/options.c	Tue Jan  1 14:44:37 2008
+++ ppp-2.4.4/pppd/options.c	Tue Jan  1 14:46:03 2008
@@ -113,6 +113,7 @@
 bool	tune_kernel;		/* may alter kernel settings */
 int	connect_delay = 1000;	/* wait this many ms after connect script */
 int	req_unit = -1;		/* requested interface unit */
+char    req_ifname[16];         /* requested interface name */
 char	path_ipup[MAXPATHLEN];	/* pathname of ip-up script */
 char	path_ipdown[MAXPATHLEN];/* pathname of ip-down script */
 bool	multilink = 0;		/* Enable multilink operation */
@@ -273,6 +274,10 @@
     { "unit", o_int, &req_unit,
       "PPP interface unit number to use if possible",
       OPT_PRIO | OPT_LLIMIT, 0, 0 },
+
+    { "ifname", o_string, req_ifname,
+      "PPP interface name to use if possible",
+      OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, sizeof(req_ifname) },
 
     { "dump", o_bool, &dump_options,
       "Print out option values after parsing all options", 1 },
diff -urN ppp-2.4.4.orig/pppd/pppd.h ppp-2.4.4/pppd/pppd.h
--- ppp-2.4.4.orig/pppd/pppd.h	Tue Jan  1 14:44:37 2008
+++ ppp-2.4.4/pppd/pppd.h	Tue Jan  1 14:46:39 2008
@@ -312,6 +312,7 @@
 extern int	connect_delay;	/* Time to delay after connect script */
 extern int	max_data_rate;	/* max bytes/sec through charshunt */
 extern int	req_unit;	/* interface unit number to use */
+extern char     req_ifname[16]; /* interface name to use */
 extern char	path_ipup[MAXPATHLEN]; /* pathname of ip-up script */
 extern char	path_ipdown[MAXPATHLEN]; /* pathname of ip-down script */
 extern bool	multilink;	/* enable multilink operation */
@@ -670,6 +671,7 @@
 #endif
 int  get_if_hwaddr __P((u_char *addr, char *name));
 char *get_first_ethernet __P((void));
+int sys_change_ifname __P((const char *, const char *));
 
 /* Procedures exported from options.c */
 int setipaddr __P((char *, char **, int)); /* Set local/remote ip addresses */
diff -urN ppp-2.4.4.orig/pppd/sys-linux.c ppp-2.4.4/pppd/sys-linux.c
--- ppp-2.4.4.orig/pppd/sys-linux.c	Tue Jan  1 14:44:37 2008
+++ ppp-2.4.4/pppd/sys-linux.c	Tue Jan  1 14:45:12 2008
@@ -2931,4 +2931,29 @@
 
     return 1;
 }
 #endif
+
+int
+sys_change_ifname(const char *old, const char *new)
+{
+    struct ifreq ifr;
+
+    SYSDEBUG ((LOG_DEBUG, "sys_change_ifname: %s -> %s\n", old, new));
+
+    memset (&ifr, '\0', sizeof (ifr));
+    strlcpy(ifr.ifr_name, old, sizeof (ifr.ifr_name));
+    strlcpy(ifr.ifr_newname, new, sizeof (ifr.ifr_newname));
+
+#ifndef SIOCSIFNAME
+#define SIOCSIFNAME 0x8923
+#endif
+    if (ioctl(sock_fd, SIOCSIFNAME, (caddr_t) &ifr) < 0) {
+       if (errno == EEXIST)
+           warn("Couldn't change name to %s as it is already in use", new);
+       else
+           error("Couldn't change name from %s to %s: %m", old, new);
+       return 0;
+    }
+    return 1;
+}
+