diff --git a/net/slirp.c b/net/slirp.c
index 4ec989b..a8fd9e6 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -885,6 +885,7 @@
 
 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
 {
+    /* TODO: IPv6 */
     struct in_addr server = { .s_addr = 0 };
     struct GuestFwd *fwd;
     const char *p;
diff --git a/slirp/misc.c b/slirp/misc.c
index d9fc586..937a418 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -28,6 +28,7 @@
   element->qh_rlink = NULL;
 }
 
+/* TODO: IPv6 */
 struct gfwd_list *
 add_guestfwd(struct gfwd_list **ex_ptr,
              SlirpWriteCb write_cb, void *opaque,
@@ -254,6 +255,8 @@
         "  Protocol[State]    FD  Source Address  Port   "
         "Dest. Address  Port RecvQ SendQ\n");
 
+    /* TODO: IPv6 */
+
     for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
         if (so->so_state & SS_HOSTFWD) {
             state = "HOST_FORWARD";
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 5559143..cbdf9f7 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -729,6 +729,7 @@
             if (ah->ar_tip == slirp->vnameserver_addr.s_addr ||
                 ah->ar_tip == slirp->vhost_addr.s_addr)
                 goto arp_ok;
+            /* TODO: IPv6 */
             for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
                 if (ex_ptr->ex_addr.s_addr == ah->ar_tip)
                     goto arp_ok;
@@ -945,6 +946,7 @@
 }
 
 /* Drop host forwarding rule, return 0 if found. */
+/* TODO: IPv6 */
 int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
                          int host_port)
 {
@@ -970,6 +972,7 @@
     return -1;
 }
 
+/* TODO: IPv6 */
 int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
                       int host_port, struct in_addr guest_addr, int guest_port)
 {
@@ -988,6 +991,7 @@
     return 0;
 }
 
+/* TODO: IPv6 */
 static bool
 check_guestfwd(Slirp *slirp, struct in_addr *guest_addr, int guest_port)
 {
@@ -1065,6 +1069,7 @@
 {
     struct socket *so;
 
+    /* TODO: IPv6 */
     for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
         if (so->so_faddr.s_addr == guest_addr.s_addr &&
             htons(so->so_fport) == guest_port) {
diff --git a/slirp/socket.c b/slirp/socket.c
index 4dc5e29..f2428a3 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -687,6 +687,7 @@
 tcp_listen(Slirp *slirp, uint32_t haddr, unsigned hport, uint32_t laddr,
            unsigned lport, int flags)
 {
+        /* TODO: IPv6 */
 	struct sockaddr_in addr;
 	struct socket *so;
 	int s, opt = 1;
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index 6749b32..b10477f 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -388,6 +388,7 @@
 	 * as if it was LISTENING, and continue...
 	 */
         if (so == NULL) {
+          /* TODO: IPv6 */
           if (slirp->restricted) {
             /* Any hostfwds will have an existing socket, so we only get here
              * for non-hostfwd connections. These should be dropped, unless it
@@ -609,6 +610,7 @@
 	   * If this is destined for the control address, then flag to
 	   * tcp_ctl once connected, otherwise connect
 	   */
+          /* TODO: IPv6 */
 	  if (af == AF_INET &&
 	         (so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
 	         slirp->vnetwork_addr.s_addr) {
diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index 1d7e72d..1db59ca 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -626,6 +626,7 @@
 	switch(so->so_emu) {
 		int x, i;
 
+        /* TODO: IPv6 */
 	 case EMU_IDENT:
 		/*
 		 * Identification protocol as per rfc-1413
@@ -964,6 +965,7 @@
     DEBUG_CALL("tcp_ctl");
     DEBUG_ARG("so = %p", so);
 
+    /* TODO: IPv6 */
     if (so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
         /* Check if it's pty_exec */
         for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
diff --git a/slirp/udp.c b/slirp/udp.c
index 3d9a19b..fa9f4a0 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -322,6 +322,7 @@
 udp_listen(Slirp *slirp, uint32_t haddr, unsigned hport, uint32_t laddr,
            unsigned lport, int flags)
 {
+        /* TODO: IPv6 */
 	struct sockaddr_in addr;
 	struct socket *so;
 	socklen_t addrlen = sizeof(struct sockaddr_in);