diff -U4 -r ppp-2.4.4/pppd/auth.c ppp-2.4.4+altname/pppd/auth.c
--- ppp-2.4.4/pppd/auth.c	2006-06-18 12:26:00.000000000 +0100
+++ ppp-2.4.4+altname/pppd/auth.c	2009-10-31 19:40:10.000000000 +0000
@@ -357,15 +357,22 @@
     { "name", o_string, our_name,
       "Set local name for authentication",
       OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
 
+    { "altname", o_string, our_name2,
+      "Set alternative local name for authentication",
+      OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
+
     { "+ua", o_special, (void *)setupapfile,
       "Get PAP user and password from file",
       OPT_PRIO | OPT_A2STRVAL, &uafname },
 
     { "user", o_string, user,
       "Set name for auth with peer", OPT_PRIO | OPT_STATIC, NULL, MAXNAMELEN },
 
+    { "altuser", o_string, user2,
+      "Set alternative name for auth with peer", OPT_PRIO | OPT_STATIC, NULL, MAXNAMELEN },
+
     { "password", o_string, passwd,
       "Password for authenticating us to the peer",
       OPT_PRIO | OPT_STATIC | OPT_HIDE, NULL, MAXSECRETLEN },
 
@@ -450,9 +457,9 @@
     l = strlen(p);
     if (l > 0 && p[l-1] == '\n')
 	p[l-1] = 0;
 
-    if (override_value("user", option_priority, fname))
+   	if (override_value("user", option_priority, fname))
 	strlcpy(user, u, sizeof(user));
     if (override_value("passwd", option_priority, fname))
 	strlcpy(passwd, p, sizeof(passwd));
 
@@ -758,33 +765,34 @@
 	}
     }
 
     new_phase(PHASE_AUTHENTICATE);
+    script_setenv("AUTHNAME", use_altname ? our_name2 : our_name, 0);
     used_login = 0;
     auth = 0;
     if (go->neg_eap) {
-	eap_authpeer(unit, our_name);
+	eap_authpeer(unit, use_altname ? our_name2 : our_name);
 	auth |= EAP_PEER;
     } else if (go->neg_chap) {
-	chap_auth_peer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
+	chap_auth_peer(unit, use_altname ? our_name2 : our_name, CHAP_DIGEST(go->chap_mdtype));
 	auth |= CHAP_PEER;
     } else if (go->neg_upap) {
 	upap_authpeer(unit);
 	auth |= PAP_PEER;
     }
     if (ho->neg_eap) {
-	eap_authwithpeer(unit, user);
+	eap_authwithpeer(unit, use_altname ? user2 : user);
 	auth |= EAP_WITHPEER;
     } else if (ho->neg_chap) {
-	chap_auth_with_peer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
+	chap_auth_with_peer(unit, use_altname ? user2 : user, CHAP_DIGEST(ho->chap_mdtype));
 	auth |= CHAP_WITHPEER;
     } else if (ho->neg_upap) {
 	if (passwd[0] == 0) {
 	    passwd_from_file = 1;
 	    if (!get_pap_passwd(passwd))
 		error("No secret found for PAP login");
 	}
-	upap_authwithpeer(unit, user, passwd);
+	upap_authwithpeer(unit, use_altname ? user2 : user, passwd);
 	auth |= PAP_WITHPEER;
     }
     auth_pending[unit] = auth;
     auth_done[unit] = 0;
@@ -1231,8 +1239,11 @@
 	auth_required = 1;
 	default_auth = 1;
     }
 
+    if (user2[0] == 0)
+	strlcpy(user2, our_name2, sizeof(user2));
+
     /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
     if (wo->chap_mdtype)
 	wo->neg_chap = 1;
 
@@ -1261,12 +1272,18 @@
     can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
     if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
 	can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
 				    our_name, 1, &lacks_ip);
+		if (our_name2[0] != 0)
+			can_auth = can_auth && have_chap_secret((explicit_remote? remote_name: NULL),
+				    our_name2, 1, &lacks_ip);
     }
     if (!can_auth && wo->neg_eap) {
 	can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
 				    our_name, 1, &lacks_ip);
+		if (our_name2[0] != 0)
+			can_auth = can_auth && have_srp_secret((explicit_remote? remote_name: NULL),
+				    our_name2, 1, &lacks_ip);
     }
 
     if (auth_required && !can_auth && noauth_addrs == NULL) {
 	if (default_auth) {
@@ -1315,29 +1332,29 @@
     hadchap = -1;
     ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
     ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
 	&& (passwd[0] != 0 ||
-	    (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
+	    (hadchap = have_chap_secret(use_altname ? user2 : user, (explicit_remote? remote_name:
 					       NULL), 0, NULL)));
     ao->neg_eap = !refuse_eap && (
 	passwd[0] != 0 ||
-	(hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
+	(hadchap == 1 || (hadchap == -1 && have_chap_secret(use_altname ? user2 : user,
 	    (explicit_remote? remote_name: NULL), 0, NULL))) ||
-	have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL));
+	have_srp_secret(use_altname ? user2 : user, (explicit_remote? remote_name: NULL), 0, NULL));
 
     hadchap = -1;
     if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
 	go->neg_upap = 0;
     if (go->neg_chap) {
 	if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
-			      our_name, 1, NULL)))
+			      use_altname ? our_name2 : our_name, 1, NULL)))
 	    go->neg_chap = 0;
     }
     if (go->neg_eap &&
 	(hadchap == 0 || (hadchap == -1 &&
-	    !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
+	    !have_chap_secret((explicit_remote? remote_name: NULL), use_altname ? our_name2 : our_name,
 		1, NULL))) &&
-	!have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
+	!have_srp_secret((explicit_remote? remote_name: NULL), use_altname ? our_name2 : our_name, 1,
 	    NULL))
 	go->neg_eap = 0;
 }
 
@@ -1409,9 +1426,9 @@
 	error("Can't open PAP password file %s: %m", filename);
 
     } else {
 	check_access(f, filename);
-	if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
+	if (scan_authfile(f, user, use_altname ? our_name2 : our_name, secret, &addrs, &opts, filename, 0) < 0) {
 	    warn("no PAP secret found for %s", user);
 	} else {
 	    /*
 	     * If the secret is "@login", it means to check
@@ -1725,9 +1742,9 @@
 	if (f == NULL)
 	    return 0;
 	check_access(f, filename);
 
-	i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
+	i = scan_authfile(f, "", use_altname ? our_name2 : our_name, secret, &addrs, &opts, filename, 0);
 	ret = i >= 0 && secret[0] == 0;
 	BZERO(secret, sizeof(secret));
 	fclose(f);
     }
@@ -1761,9 +1778,9 @@
     /*
      * Check whether a plugin wants to supply this.
      */
     if (pap_passwd_hook) {
-	ret = (*pap_passwd_hook)(user, passwd);
+	ret = (*pap_passwd_hook)(use_altname ? user2 : user, passwd);
 	if (ret >= 0)
 	    return ret;
     }
 
@@ -1771,9 +1788,9 @@
     f = fopen(filename, "r");
     if (f == NULL)
 	return 0;
     check_access(f, filename);
-    ret = scan_authfile(f, user,
+    ret = scan_authfile(f, use_altname ? user2 : user,
 			(remote_name[0]? remote_name: NULL),
 			secret, NULL, NULL, filename, 0);
     fclose(f);
     if (ret < 0)
@@ -1809,9 +1826,9 @@
     f = fopen(filename, "r");
     if (f == NULL)
 	return 0;
 
-    ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
+    ret = scan_authfile(f, (explicit_remote? remote_name: NULL), use_altname ? our_name2 : our_name,
 			NULL, &addrs, NULL, filename, 0);
     fclose(f);
     if (ret >= 0 && !some_ip_ok(addrs)) {
 	if (lacks_ipp != 0)
diff -U4 -r ppp-2.4.4/pppd/main.c ppp-2.4.4+altname/pppd/main.c
--- ppp-2.4.4/pppd/main.c	2006-06-04 04:52:50.000000000 +0100
+++ ppp-2.4.4+altname/pppd/main.c	2009-06-29 18:42:52.000000000 +0100
@@ -177,8 +177,9 @@
 int listen_time;
 int got_sigusr2;
 int got_sigterm;
 int got_sighup;
+int got_sigrtmin;
 
 static sigset_t signals_handled;
 static int waiting;
 static sigjmp_buf sigjmp;
@@ -259,8 +260,10 @@
 extern	char	*ttyname __P((int));
 extern	char	*getlogin __P((void));
 int main __P((int, char *[]));
 
+static void toggle_user __P((int));
+
 #ifdef ultrix
 #undef	O_NONBLOCK
 #define	O_NONBLOCK	O_NDELAY
 #endif
@@ -609,9 +612,9 @@
 
     kill_link = open_ccp_flag = 0;
     if (sigsetjmp(sigjmp, 1) == 0) {
 	sigprocmask(SIG_BLOCK, &signals_handled, NULL);
-	if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
+	if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld || got_sigrtmin) {
 	    sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
 	} else {
 	    waiting = 1;
 	    sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
@@ -642,8 +645,15 @@
     if (got_sigusr2) {
 	open_ccp_flag = 1;
 	got_sigusr2 = 0;
     }
+    if (got_sigrtmin) {
+		got_sigrtmin = 0;
+		if (use_altname)
+			info("Using alternative name");
+		else
+			info("Using primary name");
+	}
 }
 
 /*
  * setup_signals - initialize signal handling.
@@ -663,8 +673,9 @@
     sigaddset(&signals_handled, SIGINT);
     sigaddset(&signals_handled, SIGTERM);
     sigaddset(&signals_handled, SIGCHLD);
     sigaddset(&signals_handled, SIGUSR2);
+    sigaddset(&signals_handled, SIGRTMIN);
 
 #define SIGNAL(s, handler)	do { \
 	sa.sa_handler = handler; \
 	if (sigaction(s, &sa, NULL) < 0) \
@@ -679,8 +690,9 @@
     SIGNAL(SIGCHLD, chld);
 
     SIGNAL(SIGUSR1, toggle_debug);	/* Toggle debug flag */
     SIGNAL(SIGUSR2, open_ccp);		/* Reopen CCP */
+    SIGNAL(SIGRTMIN, toggle_user);	/* Username toggling */
 
     /*
      * Install a handler for other signals which would otherwise
      * cause pppd to exit without cleaning up.
@@ -1495,8 +1507,18 @@
 	siglongjmp(sigjmp, 1);
 }
 
 
+static void
+toggle_user(sig)
+    int sig;
+{
+	got_sigrtmin = 1;
+    use_altname = !use_altname;
+}
+
+
+
 /*
  * bad_signal - We've caught a fatal signal.  Clean up state and exit.
  */
 static void
diff -U4 -r ppp-2.4.4/pppd/options.c ppp-2.4.4+altname/pppd/options.c
--- ppp-2.4.4/pppd/options.c	2006-06-18 12:26:00.000000000 +0100
+++ ppp-2.4.4+altname/pppd/options.c	2009-10-31 19:38:13.000000000 +0000
@@ -125,8 +125,11 @@
 int maxoctets_dir = 0;       /* default - sum of traffic */
 int maxoctets_timeout = 1;   /* default 1 second */ 
 #endif
 
+char	our_name2[MAXNAMELEN];
+char	user2[MAXNAMELEN];
+int	use_altname = 0;
 
 extern option_t auth_options[];
 extern struct stat devstat;
 
diff -U4 -r ppp-2.4.4/pppd/pppd.h ppp-2.4.4+altname/pppd/pppd.h
--- ppp-2.4.4/pppd/pppd.h	2005-08-26 00:59:34.000000000 +0100
+++ ppp-2.4.4+altname/pppd/pppd.h	2009-10-31 19:38:35.000000000 +0000
@@ -288,13 +288,16 @@
 extern char	*welcomer;	/* Script to welcome client after connection */
 extern char	*ptycommand;	/* Command to run on other side of pty */
 extern int	maxconnect;	/* Maximum connect time (seconds) */
 extern char	user[MAXNAMELEN];/* Our name for authenticating ourselves */
+extern char	user2[MAXNAMELEN];/* Our name for authenticating ourselves */
 extern char	passwd[MAXSECRETLEN];	/* Password for PAP or CHAP */
 extern bool	auth_required;	/* Peer is required to authenticate */
 extern bool	persist;	/* Reopen link after it goes down */
 extern bool	uselogin;	/* Use /etc/passwd for checking PAP */
 extern char	our_name[MAXNAMELEN];/* Our name for authentication purposes */
+extern char	our_name2[MAXNAMELEN];/* Our name for authentication purposes */
+extern int	use_altname;
 extern char	remote_name[MAXNAMELEN]; /* Peer's name for authentication */
 extern bool	explicit_remote;/* remote_name specified with remotename opt */
 extern bool	demand;		/* Do dial-on-demand */
 extern char	*ipparam;	/* Extra parameter for ip up/down scripts */