diff -up ppp-2.4.5/pppd/ether.c.inc.eth ppp-2.4.5/pppd/ether.c.inc
--- ppp-2.4.5/pppd/ether.c.inc.eth	2011-06-01 10:28:35.356139063 +0200
+++ ppp-2.4.5/pppd/ether.c.inc	2011-06-01 11:20:37.876897352 +0200
@@ -0,0 +1,46 @@
+#define PREF_ETH   "eth"
+#define PREF_EM    "em"
+
+static char *dev_file = "/proc/self/net/dev";
+
+/*
+ * get_first_ethernet - return the name of the first ethernet-style
+ * interface on this system.
+ */
+char *
+get_first_ethernet()
+{
+  FILE *f;
+  char buf[255], *dv, *smc;
+  char pci[16];
+
+  memset(pci, 0, sizeof(pci));
+  if ((f = fopen(dev_file, "r")) != NULL)
+  {
+    // go through network dev file
+    while (fgets (buf, sizeof(buf), f) != NULL)
+    {
+      // the line describes interface
+      if ((smc = strchr(buf, ':')) != NULL)
+      {
+        // trim white characters
+        for (dv=buf, *smc=0; *dv <= ' '; dv++) ;
+        // is "eth" (originial ethernet name) or "em" (ethernet on board)
+        if (!strncmp(dv, PREF_ETH, strlen(PREF_ETH)) ||
+            !strncmp(dv, PREF_EM, strlen(PREF_EM)))
+        {
+          return strdup(dv);
+        }
+        // remember the first pci NIC-card
+        if (strlen(pci) == 0 && dv[0] == 'p' && isdigit(dv[1]))
+        {
+          strcpy(pci, dv);
+        }
+      }
+    }
+    fclose(f);
+  }
+  // return pci NIC-card or nil if no if name
+  return strlen(pci) > 0 ? strdup(pci) : 0L;
+}
+
diff -up ppp-2.4.5/pppd/plugins/rp-pppoe/pppoe-discovery.c.eth ppp-2.4.5/pppd/plugins/rp-pppoe/pppoe-discovery.c
--- ppp-2.4.5/pppd/plugins/rp-pppoe/pppoe-discovery.c.eth	2011-06-01 09:39:13.099343548 +0200
+++ ppp-2.4.5/pppd/plugins/rp-pppoe/pppoe-discovery.c	2011-06-01 11:41:02.188252304 +0200
@@ -47,6 +47,8 @@
 #include <net/if_arp.h>
 #endif
 
+#include "../../ether.c.inc"
+
 char *xstrdup(const char *s);
 void usage(void);
 
@@ -686,7 +688,7 @@ int main(int argc, char *argv[])
 
     /* default interface name */
     if (!conn->ifName)
-	conn->ifName = strdup("eth0");
+	conn->ifName = get_first_ethernet();
 
     conn->discoverySocket = -1;
     conn->sessionSocket = -1;
diff -up ppp-2.4.5/pppd/sys-linux.c.eth ppp-2.4.5/pppd/sys-linux.c
--- ppp-2.4.5/pppd/sys-linux.c.eth	2011-06-01 09:39:13.074343397 +0200
+++ ppp-2.4.5/pppd/sys-linux.c	2011-06-01 11:50:13.736565685 +0200
@@ -144,6 +144,8 @@
 #include <sys/locks.h>
 #endif
 
+#include "ether.c.inc"
+
 #ifdef INET6
 #ifndef _LINUX_IN6_H
 /*
@@ -1869,16 +1871,6 @@ get_if_hwaddr(u_char *addr, char *name)
 	return ret;
 }
 
-/*
- * get_first_ethernet - return the name of the first ethernet-style
- * interface on this system.
- */
-char *
-get_first_ethernet()
-{
-	return "eth0";
-}
-
 /********************************************************************
  *
  * Return user specified netmask, modified by any mask we might determine
@@ -2783,6 +2775,7 @@ ether_to_eui64(eui64_t *p_eui64)
     struct ifreq ifr;
     int skfd;
     const unsigned char *ptr;
+    char warn_msg[80];
 
     skfd = socket_fd(PF_INET6, SOCK_DGRAM, 0);
     if(skfd == -1)
@@ -2791,11 +2784,13 @@ ether_to_eui64(eui64_t *p_eui64)
         return 0;
     }
 
-    strcpy(ifr.ifr_name, "eth0");
+    strcpy(ifr.ifr_name, get_first_ethernet());
     if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
     {
         close(skfd);
-        warn("could not obtain hardware address for eth0");
+        snprintf(warn_msg, sizeof(warn_msg),
+          "could not obtain hardware address for %s", ifr.ifr_name);
+        warn(warn_msg);
         return 0;
     }
     close(skfd);