diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1b324a1..e219353 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,6 +55,7 @@ option(3PROXY_USE_SPLICE "Build Linux splice() support, slower than read/write f
 option(3PROXY_USE_POLL "Use poll() instead of select() (Unix only)" ON)
 option(3PROXY_USE_WSAPOLL "Use WSAPoll instead of select() (Windows only)" ON)
 option(3PROXY_USE_NETFILTER "Enable Linux netfilter support (Linux only)" ON)
+option(3PROXY_USE_LOCAL_PORT_RANGE "Enable per-connection local port ranges (Linux 6.3+ only)" ON)
 option(3PROXY_USE_UNIX_SOCKETS "Enable Unix domain socket support (Unix only)" ON)
 
 if(NOT WIN32 AND NOT APPLE)
@@ -185,6 +186,10 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
         add_compile_definitions(WITH_NETFILTER)
     endif()
 
+    if(3PROXY_USE_LOCAL_PORT_RANGE)
+        add_compile_definitions(WITH_LOCAL_PORT_RANGE)
+    endif()
+
     if(3PROXY_USE_UNIX_SOCKETS)
         add_compile_definitions(WITH_UN)
     endif()
diff --git a/Makefile.Linux b/Makefile.Linux
index ab6a8a7..0d094bf 100644
--- a/Makefile.Linux
+++ b/Makefile.Linux
@@ -25,6 +25,10 @@ LDFLAGS += -fno-strict-aliasing -pthread
 # makefile, including the += above and the STATIC/LIBSTATIC handling below.
 CFLAGS += $(EXTRA_CFLAGS)
 LDFLAGS += $(EXTRA_LDFLAGS)
+LOCAL_PORT_RANGE ?= true
+ifeq ($(LOCAL_PORT_RANGE),true)
+    CFLAGS += -DWITH_LOCAL_PORT_RANGE
+endif
 DLFLAGS ?= -shared
 DLSUFFICS = .ld.so
 # -lpthreads may be reuqired on some platforms instead of -pthreads
diff --git a/man/3proxy.cfg.5 b/man/3proxy.cfg.5
index 76fa4f7..efc0c87 100644
--- a/man/3proxy.cfg.5
+++ b/man/3proxy.cfg.5
@@ -817,7 +817,7 @@ with probability of 0.7) for outgoing web connections. Chains are only applied t
 .br
  type is one of:
 .br
- \fBextip\fR does not actually redirect the request; it sets the external address for this request to \fI<ip>\fR. It can be chained with another parent type. It's useful to set the external IP based on ACL or make it random.
+\fBextip\fR does not actually redirect the request; it sets the external address for this request to \fI<ip>\fR. It can be chained with another parent type. It's useful to set the external IP based on ACL or make it random. Its \fI<port>\fR argument is optional and defaults to 0. When built with \fBWITH_LOCAL_PORT_RANGE\fR on Linux 6.3 or newer, \fI<port>\fR may be an inclusive IPv4 local port range \fIFIRST-LAST\fR. The range is applied to outgoing sockets for requests matching this parent; DNS resolver traffic is not affected. For example, \fBparent 1000 extip 192.0.2.10 20000-30000\fR.
 .br
  \fBtcp\fR simply redirect connection. TCP is always last in chain. This type of proxy is a simple TCP redirection, it does not support parent authentication.
 .br
diff --git a/src/common.c b/src/common.c
index 0c21ff2..cf7ff85 100644
--- a/src/common.c
+++ b/src/common.c
@@ -10,6 +10,11 @@
 
 #include "proxy.h"
 
+#ifdef WITH_LOCAL_PORT_RANGE
+#ifndef IP_LOCAL_PORT_RANGE
+#define IP_LOCAL_PORT_RANGE 51
+#endif
+#endif
 
 char * copyright = COPYRIGHT;
 
@@ -680,6 +685,9 @@ int doconnect(struct clientparam * param){
 	}
 	*SAPORT(&param->sinsl) = 0;
 	setopts(param->remsock, param->srv->srvsockopts);
+#ifdef WITH_LOCAL_PORT_RANGE
+	if(set_local_port_range(param, param->remsock, (struct sockaddr *)&param->sinsl)) return 12;
+#endif
 
 	param->srv->so._setsockopt(param->sostate, param->remsock, SOL_SOCKET, SO_LINGER, (char *)&lg, sizeof(lg));
 #if defined SO_BINDTODEVICE
@@ -725,6 +733,16 @@ int doconnect(struct clientparam * param){
  return 0;
 }
 
+#ifdef WITH_LOCAL_PORT_RANGE
+int set_local_port_range(struct clientparam *param, SOCKET sock, const struct sockaddr *sa){
+	if(param->local_port_range && sa->sa_family == AF_INET &&
+	   ((const struct sockaddr_in *)sa)->sin_port == 0 &&
+	   param->srv->so._setsockopt(param->srv->so.state, sock, IPPROTO_IP, IP_LOCAL_PORT_RANGE,
+		(char *)&param->local_port_range, sizeof(param->local_port_range))) return -1;
+	return 0;
+}
+#endif
+
 int scanaddr(const unsigned char *s, uint32_t * ip, uint32_t * mask) {
 	unsigned d1, d2, d3, d4, m;
 	int res;
diff --git a/src/conf.c b/src/conf.c
index 3acb3a0..ce33907 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -814,6 +814,11 @@ static int h_parent(int argc, unsigned char **argv){
 		free(chains);
 		return(4);
 	}
+	if(argc < 5 && chains->type != R_EXTIP) {
+		fprintf(stderr, "Chaining error: port is required for parent type %s\n", argv[2]);
+		free(chains);
+		return(3);
+	}
 #ifdef WITH_UN
 	if(!strncmp((char *)argv[3], "unix:", 5)){
 	    make_un(argv[3] + 5, (struct sockaddr_un*)&chains->addr);
@@ -838,7 +843,34 @@ static int h_parent(int argc, unsigned char **argv){
 		*cidr = '/';
 		chains->cidr = atoi(cidr + 1);
 	}
-	*SAPORT(&chains->addr) = htons((uint16_t)atoi((char *)argv[4]));
+	if(argc > 4) {
+		char *end;
+		unsigned long port;
+
+		errno = 0;
+		port = strtoul((char *)argv[4], &end, 10);
+#ifdef WITH_LOCAL_PORT_RANGE
+		if(chains->type == R_EXTIP && *end == '-') {
+			unsigned long last;
+
+			errno = 0;
+			last = strtoul(end + 1, &end, 10);
+			if(errno || *end || !port || !last || port > last || last > 65535) {
+				free(chains->exthost);
+				free(chains);
+				return 3;
+			}
+			chains->local_port_range = ((uint32_t)last << 16) | (uint32_t)port;
+			port = 0;
+		}
+#endif
+		if(errno || *end || port > 65535) {
+			free(chains->exthost);
+			free(chains);
+			return 3;
+		}
+		*SAPORT(&chains->addr) = htons((uint16_t)port);
+	}
 	if(argc > 5) chains->extuser = (unsigned char *)strdup((char *)argv[5]);
 	if(argc > 6) chains->extpass = (unsigned char *)strdup((char *)argv[6]);
 	if(!acl->chains) {
@@ -1696,7 +1728,7 @@ struct commands commandhandlers[]={
 	{NULL, "system", h_system, 2, 2},
 	{NULL, "pidfile", h_pidfile, 2, 2},
 	{NULL, "monitor", h_monitor, 2, 2},
-	{NULL, "parent", h_parent, 5, 0},
+	{NULL, "parent", h_parent, 4, 0},
 	{NULL, "allow", h_ace, 1, 0},
 	{NULL, "deny", h_ace, 1, 0},
 	{NULL, "redirect", h_ace, 3, 0},
diff --git a/src/dnspr.c b/src/dnspr.c
index d6372e7..78ab32f 100644
--- a/src/dnspr.c
+++ b/src/dnspr.c
@@ -222,4 +222,3 @@ CLEANRET:
 #endif
  return (NULL);
 }
-
diff --git a/src/ftppr.c b/src/ftppr.c
index fbd2b4f..2f25ed8 100644
--- a/src/ftppr.c
+++ b/src/ftppr.c
@@ -121,6 +121,9 @@ void * ftpprchild(struct clientparam* param) {
 		}
 		if ((clidatasock=socket(SASOCK(&param->sincl), SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET) {RETURN(821);}
 		*SAPORT(&param->sincl) = 0;
+#ifdef WITH_LOCAL_PORT_RANGE
+		if(set_local_port_range(param, clidatasock, (struct sockaddr *)&param->sincl)){RETURN(822);}
+#endif
 		if(param->srv->so._bind(param->sostate, clidatasock, (struct sockaddr *)&param->sincl, SASIZE(&param->sincl))){RETURN(822);}
 		if (pasv) {
 			if(param->srv->so._listen(param->sostate, clidatasock, 1)) {RETURN(823);}
diff --git a/src/proxy.h b/src/proxy.h
index d5b1ec9..24b1d9a 100644
--- a/src/proxy.h
+++ b/src/proxy.h
@@ -347,6 +347,9 @@ unsigned char * dologname (unsigned char *buf, unsigned char *name, const unsign
 int readconfig(FILE * fp);
 void initcommands(void);
 int connectwithpoll(struct clientparam *param, SOCKET sock, struct sockaddr *sa, SASIZETYPE size, int to);
+#ifdef WITH_LOCAL_PORT_RANGE
+int set_local_port_range(struct clientparam *param, SOCKET sock, const struct sockaddr *sa);
+#endif
 
 
 uint32_t myrand(void);
@@ -428,4 +431,3 @@ extern char * ceargv[32];
 #define WEBBANNERS 35
 
 #endif
-
diff --git a/src/proxymain.c b/src/proxymain.c
index ec65ca9..e17710d 100644
--- a/src/proxymain.c
+++ b/src/proxymain.c
@@ -502,8 +502,8 @@ int MODULEMAINFUNC (int argc, char** argv){
 			}
 			break;
 		 case 'N':
-			if(argv[i][3] == 'e') getip46(46, (unsigned char *)argv[i]+3, (struct sockaddr *)&srv.extNat);
-			else if(argv[i][3] == 'i') getip46(46, (unsigned char *)argv[i]+3, (struct sockaddr *)&srv.intNat);
+			if(argv[i][2] == 'e') getip46(46, (unsigned char *)argv[i]+3, (struct sockaddr *)&srv.extNat);
+			else if(argv[i][2] == 'i') getip46(46, (unsigned char *)argv[i]+3, (struct sockaddr *)&srv.intNat);
 			else getip46(46, (unsigned char *)argv[i]+2, (struct sockaddr *)&srv.extNat);
 			break;
 		 case 'n':
@@ -1791,5 +1791,3 @@ FILTER_ACTION handledatfltsrv(struct clientparam *cparam, unsigned char ** buf_p
 	}
 	return PASS;
 }
-
-
diff --git a/src/redirect.c b/src/redirect.c
index a021874..f7efd22 100644
--- a/src/redirect.c
+++ b/src/redirect.c
@@ -295,6 +295,9 @@ int handleredirect(struct clientparam * param, struct ace * acentry){
 		if(!connected){
 			if(cur->type == R_EXTIP){
 				param->sinsl = cur->addr;
+#ifdef WITH_LOCAL_PORT_RANGE
+				param->local_port_range = cur->local_port_range;
+#endif
 				if(SAISNULL(&param->sinsl) && (*SAFAMILY(&param->sincr) == AF_INET || *SAFAMILY(&param->sincr) == AF_INET6))param->sinsl = param->sincr;
 #ifndef NOIPV6
 				else if(cur->cidr && *SAFAMILY(&param->sinsl) == AF_INET6){
diff --git a/src/resolve.c b/src/resolve.c
index 3d4eacc..dbb91fe 100644
--- a/src/resolve.c
+++ b/src/resolve.c
@@ -198,4 +198,4 @@ uint32_t fakeresolver (int af, unsigned char *name, unsigned char * value){
     value[3] = 2;
  }
  return 1;
-}
\ No newline at end of file
+}
diff --git a/src/socks.c b/src/socks.c
index 1874745..e542f12 100644
--- a/src/socks.c
+++ b/src/socks.c
@@ -250,6 +250,9 @@ void * sockschild(struct clientparam* param) {
  }
 
  if(command > 1) {
+#ifdef WITH_LOCAL_PORT_RANGE
+	if(set_local_port_range(param, param->remsock, (struct sockaddr *)&param->sinsl)) RETURN(12);
+#endif
 	if(param->srv->so._bind(param->sostate, param->remsock,(struct sockaddr *)&param->sinsl,SASIZE(&param->sinsl))) {
 		*SAPORT(&param->sinsl) = 0;
 		if(param->srv->so._bind(param->sostate, param->remsock,(struct sockaddr *)&param->sinsl,SASIZE(&param->sinsl)))RETURN (12);
diff --git a/src/structures.h b/src/structures.h
index 8d7eeb2..0593b32 100644
--- a/src/structures.h
+++ b/src/structures.h
@@ -335,6 +335,9 @@ struct chain {
 	unsigned char * extpass;
 	unsigned short weight;
 	unsigned short cidr;
+#ifdef WITH_LOCAL_PORT_RANGE
+	uint32_t local_port_range;
+#endif
 };
 
 struct period {
@@ -666,6 +669,9 @@ struct clientparam {
 			maxtrafout64;
 	PROXYSOCKADDRTYPE sincl, sincr;
 	PROXYSOCKADDRTYPE	sinsl, sinsr, req;
+#ifdef WITH_LOCAL_PORT_RANGE
+	uint32_t local_port_range;
+#endif
 
 	uint64_t	statscli64,
 			statssrv64;
diff --git a/src/udppm.c b/src/udppm.c
index 6d6b4bb..025b687 100644
--- a/src/udppm.c
+++ b/src/udppm.c
@@ -46,6 +46,9 @@ void * udppmchild(struct clientparam* param) {
 	*SAPORT(&param->sinsl) = 0;
 	param->remsock = param->srv->so._socket(param->srv->so.state, SASOCK(&param->sinsl), SOCK_DGRAM, IPPROTO_UDP);
 	if(param->remsock == INVALID_SOCKET) { RETURN(202); }
+#ifdef WITH_LOCAL_PORT_RANGE
+	if(set_local_port_range(param, param->remsock, (struct sockaddr *)&param->sinsl)) { RETURN(203); }
+#endif
 	if(param->srv->so._bind(param->srv->so.state, param->remsock, (struct sockaddr *)&param->sinsl, SASIZE(&param->sinsl))) { RETURN(203); }
 #ifdef _WIN32
 	{ unsigned long ul2 = 1; ioctlsocket(param->remsock, FIONBIO, &ul2); }