diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index 1b56cf2d..b34c1fcd 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -305,6 +305,10 @@ a lot of data that needs to be copied, this should be set high. */
 #define SLIPIF_THREAD_PRIO 1
 #endif
 
+#ifndef PPP_THREAD_PRIO
+#define PPP_THREAD_PRIO 1
+#endif
+
 #ifndef DEFAULT_THREAD_PRIO
 #define DEFAULT_THREAD_PRIO 1
 #endif
@@ -327,6 +331,94 @@ a lot of data that needs to be copied, this should be set high. */
 
 #endif /* LWIP_STATS */
 
+/* ---------- PPP options ---------- */
+
+#ifndef PPP_SUPPORT
+#define PPP_SUPPORT      0      /* Set for PPP */
+#endif
+
+#if PPP_SUPPORT 
+
+#define NUM_PPP 1           /* Max PPP sessions. */
+
+
+
+#ifndef PAP_SUPPORT
+#define PAP_SUPPORT      0      /* Set for PAP. */
+#endif
+
+#ifndef CHAP_SUPPORT
+#define CHAP_SUPPORT     0      /* Set for CHAP. */
+#endif
+
+#define MSCHAP_SUPPORT   0      /* Set for MSCHAP (NOT FUNCTIONAL!) */
+#define CBCP_SUPPORT     0      /* Set for CBCP (NOT FUNCTIONAL!) */
+#define CCP_SUPPORT      0      /* Set for CCP (NOT FUNCTIONAL!) */
+
+#ifndef VJ_SUPPORT
+#define VJ_SUPPORT       0      /* Set for VJ header compression. */
+#endif
+
+#ifndef MD5_SUPPORT
+#define MD5_SUPPORT      0      /* Set for MD5 (see also CHAP) */
+#endif
+
+
+/*
+ * Timeouts.
+ */
+#define FSM_DEFTIMEOUT		6	/* Timeout time in seconds */
+#define FSM_DEFMAXTERMREQS	2	/* Maximum Terminate-Request transmissions */
+#define FSM_DEFMAXCONFREQS	10	/* Maximum Configure-Request transmissions */
+#define FSM_DEFMAXNAKLOOPS	5	/* Maximum number of nak loops */
+
+#define UPAP_DEFTIMEOUT		6	/* Timeout (seconds) for retransmitting req */
+#define UPAP_DEFREQTIME		30	/* Time to wait for auth-req from peer */
+
+#define CHAP_DEFTIMEOUT		6	/* Timeout time in seconds */
+#define CHAP_DEFTRANSMITS	10	/* max # times to send challenge */
+
+
+/* Interval in seconds between keepalive echo requests, 0 to disable. */
+#if 1
+#define LCP_ECHOINTERVAL 0
+#else
+#define LCP_ECHOINTERVAL 10
+#endif
+
+/* Number of unanswered echo requests before failure. */
+#define LCP_MAXECHOFAILS 3
+
+/* Max Xmit idle time (in jiffies) before resend flag char. */
+#define PPP_MAXIDLEFLAG 100
+
+/*
+ * Packet sizes
+ *
+ * Note - lcp shouldn't be allowed to negotiate stuff outside these
+ *    limits.  See lcp.h in the pppd directory.
+ * (XXX - these constants should simply be shared by lcp.c instead
+ *    of living in lcp.h)
+ */
+#define PPP_MTU     1500     /* Default MTU (size of Info field) */
+#if 0
+#define PPP_MAXMTU  65535 - (PPP_HDRLEN + PPP_FCSLEN)
+#else
+#define PPP_MAXMTU  1500 /* Largest MTU we allow */
+#endif
+#define PPP_MINMTU  64
+#define PPP_MRU     1500     /* default MRU = max length of info field */
+#define PPP_MAXMRU  1500     /* Largest MRU we allow */
+#define PPP_DEFMRU	296		/* Try for this */
+#define PPP_MINMRU	128		/* No MRUs below this */
+
+
+#define MAXNAMELEN      256     /* max length of hostname or name for auth */
+#define MAXSECRETLEN    256     /* max length of password or secret */
+
+#endif /* PPP_SUPPORT */
+
+
 /* Debugging options all default to off */
 
 #ifndef DBG_TYPES_ON