diff --git a/src/include/netif/ppp/ppp.h b/src/include/netif/ppp/ppp.h
index 1d00ff6b..51c8af29 100644
--- a/src/include/netif/ppp/ppp.h
+++ b/src/include/netif/ppp/ppp.h
@@ -306,37 +306,6 @@ struct ppp_addrs {
  * Extended asyncmap - allows any character to be escaped.
  */
 typedef u_char  ext_accm[32];
-
-/* PPP packet parser states.  Current state indicates operation yet to be
- * completed. */
-typedef enum {
-  PDIDLE = 0,  /* Idle state - waiting. */
-  PDSTART,     /* Process start flag. */
-  PDADDRESS,   /* Process address field. */
-  PDCONTROL,   /* Process control field. */
-  PDPROTOCOL1, /* Process protocol field 1. */
-  PDPROTOCOL2, /* Process protocol field 2. */
-  PDDATA       /* Process data byte. */
-} ppp_dev_states;
-
-/*
- * PPP interface RX control block.
- */
-typedef struct ppp_pcb_rx_s {
-  /** ppp descriptor */
-  ppp_pcb *pcb;
-  /** the rx file descriptor */
-  sio_fd_t fd;
-
-  /* The input packet. */
-  struct pbuf *in_head, *in_tail;
-
-  u16_t in_protocol;             /* The input protocol code. */
-  u16_t in_fcs;                  /* Input Frame Check Sequence value. */
-  ppp_dev_states in_state;       /* The input process state. */
-  char in_escaped;               /* Escape next character. */
-  ext_accm in_accm;              /* Async-Ctl-Char-Map for input. */
-} ppp_pcb_rx;
 #endif /* PPPOS_SUPPORT */
 
 /*
@@ -402,7 +371,6 @@ struct ppp_pcb_s {
 /* FIXME: there is probably one superfluous */
   ext_accm out_accm;             /* Async-Ctl-Char-Map for output. */
   ext_accm xmit_accm;            /* extended transmit ACCM */
-  ppp_pcb_rx rx;
 #endif /* PPPOS_SUPPORT */
 
   u32_t last_xmit;               /* Time of last transmission. */
diff --git a/src/include/netif/ppp/pppos.h b/src/include/netif/ppp/pppos.h
index 5b89803b..c933a1aa 100644
--- a/src/include/netif/ppp/pppos.h
+++ b/src/include/netif/ppp/pppos.h
@@ -43,6 +43,37 @@
 #include "ppp.h"
 #include "vj.h"
 
+/* PPP packet parser states.  Current state indicates operation yet to be
+ * completed. */
+typedef enum {
+  PDIDLE = 0,  /* Idle state - waiting. */
+  PDSTART,     /* Process start flag. */
+  PDADDRESS,   /* Process address field. */
+  PDCONTROL,   /* Process control field. */
+  PDPROTOCOL1, /* Process protocol field 1. */
+  PDPROTOCOL2, /* Process protocol field 2. */
+  PDDATA       /* Process data byte. */
+} pppos_rx_state;
+
+/*
+ * PPP interface RX control block.
+ */
+typedef struct ppp_pcb_rx_s {
+  /** ppp descriptor */
+  ppp_pcb *pcb;
+  /** the rx file descriptor */
+  sio_fd_t fd;
+
+  /* The input packet. */
+  struct pbuf *in_head, *in_tail;
+
+  u16_t in_protocol;             /* The input protocol code. */
+  u16_t in_fcs;                  /* Input Frame Check Sequence value. */
+  pppos_rx_state in_state;       /* The input process state. */
+  char in_escaped;               /* Escape next character. */
+  ext_accm in_accm;              /* Async-Ctl-Char-Map for input. */
+} ppp_pcb_rx;
+
 /*
  * PPPoS interface control block.
  */
@@ -51,6 +82,7 @@ struct pppos_pcb_s {
   pppos_pcb *next;
   ppp_pcb *ppp;                  /* PPP PCB */
   sio_fd_t fd;                   /* File device ID of port. */
+  ppp_pcb_rx rx;
 #if VJ_SUPPORT
   struct vjcompress vj_comp;     /* Van Jacobson compression header. */
 #endif /* VJ_SUPPORT */
@@ -64,6 +96,7 @@ ppp_pcb *ppp_over_serial_create(struct netif *pppif, sio_fd_t fd,
 void pppos_input(ppp_pcb *ppp, u_char* data, int len);
 
 
+void pppos_accm_in_config(pppos_pcb *pppos, u32_t accm);
 sio_fd_t pppos_get_fd(pppos_pcb *pppos);
 void pppos_vjc_config(pppos_pcb *pppos, int vjcomp, int cidcomp, int maxcid);
 int pppos_vjc_comp(pppos_pcb *pppos, struct pbuf *pb);
diff --git a/src/netif/ppp/ppp.c b/src/netif/ppp/ppp.c
index bc022806..e481b20c 100644
--- a/src/netif/ppp/ppp.c
+++ b/src/netif/ppp/ppp.c
@@ -931,34 +931,17 @@ int ppp_send_config(ppp_pcb *pcb, int mtu, u32_t accm, int pcomp, int accomp) {
  * the ppp interface.
  */
 int ppp_recv_config(ppp_pcb *pcb, int mru, u32_t accm, int pcomp, int accomp) {
-#if PPPOS_SUPPORT
-  int i;
-  SYS_ARCH_DECL_PROTECT(lev);
-#endif /* PPPOS_SUPPORT */
-
   LWIP_UNUSED_ARG(accomp);
   LWIP_UNUSED_ARG(pcomp);
   LWIP_UNUSED_ARG(mru);
 
-  /* Load the ACCM bits for the 32 control codes. */
 #if PPPOS_SUPPORT
-  SYS_ARCH_PROTECT(lev);
-  for (i = 0; i < 32 / 8; i++) {
-    /* @todo: does this work? ext_accm has been modified from pppd! */
-    pcb->rx.in_accm[i] = (u_char)(accm >> (i * 8));
-  }
-  SYS_ARCH_UNPROTECT(lev);
-#else
+  pppos_accm_in_config((pppos_pcb*)pcb->link_ctx_cb, accm);
+#else /* PPPOS_SUPPORT */
   LWIP_UNUSED_ARG(accm);
 #endif /* PPPOS_SUPPORT */
 
-#if PPPOS_SUPPORT
-  PPPDEBUG(LOG_INFO, ("ppp_recv_config[%d]: in_accm=%X %X %X %X\n",
-            pcb->num,
-            pcb->rx.in_accm[0], pcb->rx.in_accm[1], pcb->rx.in_accm[2], pcb->rx.in_accm[3]));
-#else
-  PPPDEBUG(LOG_INFO, ("ppp_recv_config[%d]\n", pcb->num) );
-#endif /* PPPOS_SUPPORT */
+  PPPDEBUG(LOG_INFO, ("ppp_recv_config[%d]\n", pcb->num));
   return 0;
 }
 
diff --git a/src/netif/ppp/pppos.c b/src/netif/ppp/pppos.c
index 5536f15a..677bd709 100644
--- a/src/netif/ppp/pppos.c
+++ b/src/netif/ppp/pppos.c
@@ -406,12 +406,14 @@ pppos_connect(pppos_pcb *pppos)
 #endif /* !VJ_SUPPORT */
 
   /* input pbuf left over from last session? */
-  pppos_free_current_input_packet(&ppp->rx);
+  pppos_free_current_input_packet(&pppos->rx);
 
   ppp_clear(ppp);
+  /* reset PPPoS control block to its initial state */
+  memset(&pppos->rx, 0, sizeof(pppos_pcb) - ( (char*)&((pppos_pcb*)0)->rx - (char*)0 ) );
 
-  ppp->rx.pcb = ppp;
-  ppp->rx.fd = pppos->fd;
+  pppos->rx.pcb = ppp;
+  pppos->rx.fd = pppos->fd;
 
 #if VJ_SUPPORT
   vj_compress_init(&pppos->vj_comp);
@@ -430,7 +432,7 @@ pppos_connect(pppos_pcb *pppos)
    * Default the in and out accm so that escape and flag characters
    * are always escaped.
    */
-  ppp->rx.in_accm[15] = 0x60; /* no need to protect since RX is not running */
+  pppos->rx.in_accm[15] = 0x60; /* no need to protect since RX is not running */
   ppp->out_accm[15] = 0x60;
 
   /*
@@ -454,7 +456,6 @@ pppos_disconnect(pppos_pcb *pppos)
 static err_t
 pppos_destroy(pppos_pcb *pppos)
 {
-  ppp_pcb *ppp = pppos->ppp;
   pppos_pcb **copp, *freep;
 
   /* remove interface from list */
@@ -466,7 +467,7 @@ pppos_destroy(pppos_pcb *pppos)
   }
 
   /* input pbuf left ? */
-  pppos_free_current_input_packet(&ppp->rx);
+  pppos_free_current_input_packet(&pppos->rx);
 
   memp_free(MEMP_PPPOS_PCB, pppos);
   return ERR_OK;
@@ -498,8 +499,8 @@ PACK_STRUCT_END
 void
 pppos_input(ppp_pcb *ppp, u_char *s, int l)
 {
-  ppp_pcb_rx *pcrx = &ppp->rx;
   pppos_pcb *pppos = (pppos_pcb *)ppp->link_ctx_cb;
+  ppp_pcb_rx *pcrx = &pppos->rx;
   struct pbuf *next_pbuf;
   u_char cur_char;
   u_char escaped;
@@ -743,6 +744,30 @@ drop:
 }
 #endif /* PPP_INPROC_MULTITHREADED */
 
+void
+pppos_accm_in_config(pppos_pcb *pppos, u32_t accm)
+{
+  ppp_pcb *ppp;
+  int i;
+  SYS_ARCH_DECL_PROTECT(lev);
+
+  if (!pppos_exist(pppos)) {
+    return;
+  }
+  ppp = pppos->ppp;
+
+  /* Load the ACCM bits for the 32 control codes. */
+  SYS_ARCH_PROTECT(lev);
+  for (i = 0; i < 32 / 8; i++) {
+    pppos->rx.in_accm[i] = (u_char)(accm >> (i * 8));
+  }
+  SYS_ARCH_UNPROTECT(lev);
+
+  PPPDEBUG(LOG_INFO, ("pppos_accm_in_config[%d]: in_accm=%X %X %X %X\n",
+            ppp->num,
+            pppos->rx.in_accm[0], pppos->rx.in_accm[1], pppos->rx.in_accm[2], pppos->rx.in_accm[3]));
+}
+
 sio_fd_t
 pppos_get_fd(pppos_pcb *pppos)
 {
@@ -900,7 +925,7 @@ pppos_append(u_char c, struct pbuf *nb, ext_accm *out_accm)
 static void
 pppos_drop(pppos_pcb *pppos)
 {
-  ppp_pcb_rx *pcrx = &pppos->ppp->rx;
+  ppp_pcb_rx *pcrx = &pppos->rx;
 #if LWIP_SNMP
   ppp_pcb *ppp = pppos->ppp;
 #endif /* LWIP_SNMP || VJ_SUPPORT */