diff -Naurp httpd-2.4.1/docs/man/ab.1 httpd-2.4.1.oden/docs/man/ab.1
--- httpd-2.4.1/docs/man/ab.1	2012-01-09 18:03:50.000000000 +0100
+++ httpd-2.4.1.oden/docs/man/ab.1	2012-03-03 12:55:24.277176752 +0100
@@ -124,6 +124,9 @@ String to use as attributes for <table>\
 -X \fIproxy\fR[:\fIport\fR]
 Use a proxy server for the requests\&.  
 .TP
+-s \fIsrc_address\fR
+Set the local source address\&.  
+.TP
 -y \fI<tr>-attributes\fR
 String to use as attributes for <tr>\&.  
 .TP
diff -Naurp httpd-2.4.1/support/ab.c httpd-2.4.1.oden/support/ab.c
--- httpd-2.4.1/support/ab.c	2011-10-01 21:48:14.000000000 +0200
+++ httpd-2.4.1.oden/support/ab.c	2012-03-03 12:57:29.040169570 +0100
@@ -291,6 +291,7 @@ int proxyport = 0;      /* proxy port */
 const char *connecthost;
 const char *myhost;
 apr_port_t connectport;
+char *src_address;
 const char *gnuplot;          /* GNUplot file */
 const char *csvperc;          /* CSV Percentile file */
 char url[1024];
@@ -1166,6 +1167,7 @@ static void output_html_results(void)
 static void start_connect(struct connection * c)
 {
     apr_status_t rv;
+    apr_sockaddr_t *from;
 
     if (!(started < requests))
     return;
@@ -1213,6 +1215,14 @@ static void start_connect(struct connect
         }
     }
 
+    if (src_address) {
+        if ((rv = apr_sockaddr_info_get(&from, src_address, destsa->family,
+                0, 0, c->ctx)) != APR_SUCCESS)
+                apr_err("src_address get", rv);
+        if ((rv = apr_socket_bind(c->aprsock, from)) != APR_SUCCESS)
+            apr_err("src_address bind", rv);
+    }
+
     c->start = lasttime = apr_time_now();
 #ifdef USE_SSL
     if (is_ssl) {
@@ -1874,6 +1884,7 @@ static void usage(const char *progname)
     fprintf(stderr, "    -P attribute    Add Basic Proxy Authentication, the attributes\n");
     fprintf(stderr, "                    are a colon separated username and password.\n");
     fprintf(stderr, "    -X proxy:port   Proxyserver and port number to use\n");
+    fprintf(stderr, "    -s src_address  Set the local source address\n");
     fprintf(stderr, "    -V              Print version number and exit\n");
     fprintf(stderr, "    -k              Use HTTP KeepAlive feature\n");
     fprintf(stderr, "    -d              Do not show percentiles served table.\n");
@@ -2052,7 +2063,7 @@ int main(int argc, const char * const ar
     myhost = NULL; /* 0.0.0.0 or :: */
 
     apr_getopt_init(&opt, cntxt, argc, argv);
-    while ((status = apr_getopt(opt, "n:c:t:b:T:p:u:v:rkVhwix:y:z:C:H:P:A:g:X:de:SqB:"
+    while ((status = apr_getopt(opt, "s:n:c:t:b:T:p:u:v:rkVhwix:y:z:C:H:P:A:g:X:de:SqB:"
 #ifdef USE_SSL
             "Z:f:"
 #endif
@@ -2067,6 +2078,9 @@ int main(int argc, const char * const ar
             case 'k':
                 keepalive = 1;
                 break;
+            case 's':
+                src_address = strdup(optarg);
+                break;
             case 'q':
                 heartbeatres = 0;
                 break;