diff --git a/usr.sbin/ppp/defs.h b/usr.sbin/ppp/defs.h
index dcda03a3cec2..9efdaca3563c 100644
--- a/usr.sbin/ppp/defs.h
+++ b/usr.sbin/ppp/defs.h
@@ -119,6 +119,8 @@
 
 #define ROUNDUP(x) ((x) ? (1 + (((x) - 1) | (sizeof(long) - 1))) : sizeof(long))
 
+#define NCP_ASCIIBUFFERSIZE	52
+
 #ifdef __NetBSD__
 extern void randinit(void);
 #else
diff --git a/usr.sbin/ppp/iface.c b/usr.sbin/ppp/iface.c
index ae96f98b64ba..858fb1502d27 100644
--- a/usr.sbin/ppp/iface.c
+++ b/usr.sbin/ppp/iface.c
@@ -209,7 +209,7 @@ iface_addr_Zap(const char *name, struct iface_addr *addr, int s)
 #endif
   struct sockaddr_in *me4, *msk4, *peer4;
   struct sockaddr_storage ssme, sspeer, ssmsk;
-  int res;
+  int res, saved_errno;
 
   ncprange_getsa(&addr->ifa, &ssme, &ssmsk);
   ncpaddr_getsa(&addr->peer, &sspeer);
@@ -235,8 +235,9 @@ iface_addr_Zap(const char *name, struct iface_addr *addr, int s)
       memcpy(peer4, &sspeer, sizeof *peer4);
 
     res = ID0ioctl(s, SIOCDIFADDR, &ifra);
+    saved_errno = errno;
     if (log_IsKept(LogDEBUG)) {
-      char buf[100];
+      char buf[NCP_ASCIIBUFFERSIZE];
 
       snprintf(buf, sizeof buf, "%s", ncprange_ntoa(&addr->ifa));
       log_Printf(LogWARN, "%s: DIFADDR %s -> %s returns %d\n",
@@ -260,12 +261,13 @@ iface_addr_Zap(const char *name, struct iface_addr *addr, int s)
     ifra6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
 
     res = ID0ioctl(s, SIOCDIFADDR_IN6, &ifra6);
+    saved_errno = errno;
     break;
 #endif
   }
 
   if (res == -1) {
-    char dst[40];
+    char dst[NCP_ASCIIBUFFERSIZE];
     const char *end =
 #ifndef NOINET6
       ncprange_family(&addr->ifa) == AF_INET6 ? "_IN6" :
@@ -274,11 +276,11 @@ iface_addr_Zap(const char *name, struct iface_addr *addr, int s)
 
     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
       log_Printf(LogWARN, "iface rm: ioctl(SIOCDIFADDR%s, %s): %s\n",
-                 end, ncprange_ntoa(&addr->ifa), strerror(errno));
+                 end, ncprange_ntoa(&addr->ifa), strerror(saved_errno));
     else {
       snprintf(dst, sizeof dst, "%s", ncpaddr_ntoa(&addr->peer));
       log_Printf(LogWARN, "iface rm: ioctl(SIOCDIFADDR%s, %s -> %s): %s\n",
-                 end, ncprange_ntoa(&addr->ifa), dst, strerror(errno));
+                 end, ncprange_ntoa(&addr->ifa), dst, strerror(saved_errno));
     }
   }
 
@@ -294,7 +296,7 @@ iface_addr_Add(const char *name, struct iface_addr *addr, int s)
 #endif
   struct sockaddr_in *me4, *msk4, *peer4;
   struct sockaddr_storage ssme, sspeer, ssmsk;
-  int res;
+  int res, saved_errno;
 
   ncprange_getsa(&addr->ifa, &ssme, &ssmsk);
   ncpaddr_getsa(&addr->peer, &sspeer);
@@ -320,8 +322,9 @@ iface_addr_Add(const char *name, struct iface_addr *addr, int s)
       memcpy(peer4, &sspeer, sizeof *peer4);
 
     res = ID0ioctl(s, SIOCAIFADDR, &ifra);
+    saved_errno = errno;
     if (log_IsKept(LogDEBUG)) {
-      char buf[100];
+      char buf[NCP_ASCIIBUFFERSIZE];
 
       snprintf(buf, sizeof buf, "%s", ncprange_ntoa(&addr->ifa));
       log_Printf(LogWARN, "%s: AIFADDR %s -> %s returns %d\n",
@@ -345,12 +348,13 @@ iface_addr_Add(const char *name, struct iface_addr *addr, int s)
     ifra6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
 
     res = ID0ioctl(s, SIOCAIFADDR_IN6, &ifra6);
+    saved_errno = errno;
     break;
 #endif
   }
 
   if (res == -1) {
-    char dst[40];
+    char dst[NCP_ASCIIBUFFERSIZE];
     const char *end =
 #ifndef NOINET6
       ncprange_family(&addr->ifa) == AF_INET6 ? "_IN6" :
@@ -359,11 +363,11 @@ iface_addr_Add(const char *name, struct iface_addr *addr, int s)
 
     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
       log_Printf(LogWARN, "iface add: ioctl(SIOCAIFADDR%s, %s): %s\n",
-                 end, ncprange_ntoa(&addr->ifa), strerror(errno));
+                 end, ncprange_ntoa(&addr->ifa), strerror(saved_errno));
     else {
       snprintf(dst, sizeof dst, "%s", ncpaddr_ntoa(&addr->peer));
       log_Printf(LogWARN, "iface add: ioctl(SIOCAIFADDR%s, %s -> %s): %s\n",
-                 end, ncprange_ntoa(&addr->ifa), dst, strerror(errno));
+                 end, ncprange_ntoa(&addr->ifa), dst, strerror(saved_errno));
     }
   }
 
diff --git a/usr.sbin/ppp/ip.c b/usr.sbin/ppp/ip.c
index d04fb9db2935..de4f8d1a4bf3 100644
--- a/usr.sbin/ppp/ip.c
+++ b/usr.sbin/ppp/ip.c
@@ -226,7 +226,7 @@ FilterCheck(const unsigned char *packet,
   int match;			/* true if condition matched */
   int mindata;			/* minimum data size or zero */
   const struct filterent *fp = filter->rule;
-  char dbuff[100], dstip[16];
+  char dbuff[100], dstip[NCP_ASCIIBUFFERSIZE];
   struct ncpaddr srcaddr, dstaddr;
   const char *payload;		/* IP payload */
   int datalen;			/* IP datagram length */
diff --git a/usr.sbin/ppp/ipv6cp.c b/usr.sbin/ppp/ipv6cp.c
index dd70216ec167..7f4c0c9277aa 100644
--- a/usr.sbin/ppp/ipv6cp.c
+++ b/usr.sbin/ppp/ipv6cp.c
@@ -467,7 +467,7 @@ ipv6cp_LayerUp(struct fsm *fp)
 {
   /* We're now up */
   struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
-  char tbuff[40];
+  char tbuff[NCP_ASCIIBUFFERSIZE];
 
   log_Printf(LogIPV6CP, "%s: LayerUp.\n", fp->link->name);
   if (!ipv6cp_InterfaceUp(ipv6cp))
@@ -524,7 +524,7 @@ ipv6cp_LayerDown(struct fsm *fp)
   /* About to come down */
   struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
   static int recursing;
-  char addr[40];
+  char addr[NCP_ASCIIBUFFERSIZE];
 
   if (!recursing++) {
     snprintf(addr, sizeof addr, "%s", ncpaddr_ntoa(&ipv6cp->myaddr));
diff --git a/usr.sbin/ppp/ncpaddr.c b/usr.sbin/ppp/ncpaddr.c
index b4c166aca692..4e086eb5e377 100644
--- a/usr.sbin/ppp/ncpaddr.c
+++ b/usr.sbin/ppp/ncpaddr.c
@@ -78,8 +78,6 @@
 #define ncpaddr_ip6addr		u.ip6addr
 #endif
 
-#define	NCP_ASCIIBUFFERSIZE	52
-
 static struct in_addr
 bits2mask4(int bits)
 {
diff --git a/usr.sbin/ppp/route.c b/usr.sbin/ppp/route.c
index cfce3ac768a7..72dbf65fef2b 100644
--- a/usr.sbin/ppp/route.c
+++ b/usr.sbin/ppp/route.c
@@ -437,7 +437,7 @@ route_IfDelete(struct bundle *bundle, int all)
            ) &&
           (all || (rtm->rtm_flags & RTF_GATEWAY))) {
         if (log_IsKept(LogDEBUG)) {
-          char gwstr[41];
+          char gwstr[NCP_ASCIIBUFFERSIZE];
           struct ncpaddr gw;
           ncprange_setsa(&range, sa[RTAX_DST], sa[RTAX_NETMASK]);
           ncpaddr_setsa(&gw, sa[RTAX_GATEWAY]);
@@ -843,7 +843,7 @@ rt_Set(struct bundle *bundle, int cmd, const struct ncprange *dst,
   }
 
   if (log_IsKept(LogDEBUG)) {
-    char gwstr[40];
+    char gwstr[NCP_ASCIIBUFFERSIZE];
 
     if (gw)
       snprintf(gwstr, sizeof gwstr, "%s", ncpaddr_ntoa(gw));