diff --git a/src/common/config.h b/src/common/config.h
index ba0af7b..e9217b2 100644
--- a/src/common/config.h
+++ b/src/common/config.h
@@ -49,4 +49,8 @@
 #define MAX_RL_FLOW 100000
 
 // Maximum entries in block map.
-#define MAX_BLOCK 100000
\ No newline at end of file
+#define MAX_BLOCK 100000
+
+// Enables IPv6.
+// If you're not using IPv6, this will speed up performance of the XDP program.
+#define ENABLE_IPV6
\ No newline at end of file
diff --git a/src/common/types.h b/src/common/types.h
index 0267412..e66011d 100644
--- a/src/common/types.h
+++ b/src/common/types.h
@@ -10,8 +10,10 @@ struct filter_ip
     u32 dst_ip;
     u8 dst_cidr;
 
+#ifdef ENABLE_IPV6
     u32 src_ip6[4];
     u32 dst_ip6[4];
+#endif
 
     unsigned int do_min_ttl : 1;
     u8 min_ttl;
diff --git a/src/loader/prog.c b/src/loader/prog.c
index 2d8d2d6..71b15e6 100644
--- a/src/loader/prog.c
+++ b/src/loader/prog.c
@@ -321,7 +321,7 @@ int main(int argc, char *argv[])
         {
             log_msg(&cfg, 3, 0, "BPF map 'map_block' pinned to '%s/map_block'.", XDP_MAP_PIN_DIR);
         }
-
+#ifdef ENABLE_IPV6
         if ((ret = pin_bpf_map(obj, XDP_MAP_PIN_DIR, "map_block6")) != 0)
         {
             log_msg(&cfg, 1, 0, "[WARNING] Failed to pin 'map_block6' to file system (%d)...", ret);
@@ -330,6 +330,7 @@ int main(int argc, char *argv[])
         {
             log_msg(&cfg, 3, 0, "BPF map 'map_block6' pinned to '%s/map_block6'.", XDP_MAP_PIN_DIR);
         }
+#endif
 
 #ifdef ENABLE_IP_RANGE_DROP
         // Pin the IPv4 range drop map.
diff --git a/src/loader/utils/xdp.c b/src/loader/utils/xdp.c
index 3c9e51f..d11054f 100644
--- a/src/loader/utils/xdp.c
+++ b/src/loader/utils/xdp.c
@@ -304,7 +304,8 @@ int update_filter(int map_filters, filter_rule_cfg_t* filter_cfg, int idx)
         filter.ip.dst_ip = ip_range.ip;
         filter.ip.dst_cidr = ip_range.cidr;
     }
-
+    
+#ifdef ENABLE_IPV6
     if (filter_cfg->ip.src_ip6)
     {
         struct in6_addr in;
@@ -322,6 +323,7 @@ int update_filter(int map_filters, filter_rule_cfg_t* filter_cfg, int idx)
 
         memcpy(filter.ip.dst_ip6, in.__in6_u.__u6_addr32, 4);
     }
+#endif
 
     if (filter_cfg->ip.min_ttl > -1)
     {
diff --git a/src/xdp/prog.c b/src/xdp/prog.c
index 1de558d..2dbf92a 100644
--- a/src/xdp/prog.c
+++ b/src/xdp/prog.c
@@ -46,7 +46,11 @@ int xdp_prog_main(struct xdp_md *ctx)
     }
 
     // Check Ethernet protocol.
+#ifdef ENABLE_IPV6
     if (unlikely(eth->h_proto != htons(ETH_P_IP) && eth->h_proto != htons(ETH_P_IPV6)))
+#else
+    if (unlikely(eth->h_proto != htons(ETH_P_IP)))
+#endif
     {
         inc_pkt_stats(stats, STATS_TYPE_PASSED);
         
@@ -59,7 +63,19 @@ int xdp_prog_main(struct xdp_md *ctx)
     u128 src_ip6 = 0;
 
     // Set IPv4 and IPv6 common variables.
-    if (eth->h_proto == htons(ETH_P_IPV6))
+    if (eth->h_proto == htons(ETH_P_IP))
+    {
+        iph = data + sizeof(struct ethhdr);
+
+        if (unlikely(iph + 1 > (struct iphdr *)data_end))
+        {
+            inc_pkt_stats(stats, STATS_TYPE_DROPPED);
+
+            return XDP_DROP;
+        }
+    }
+#ifdef ENABLE_IPV6
+    else
     {
         iph6 = data + sizeof(struct ethhdr);
 
@@ -72,17 +88,7 @@ int xdp_prog_main(struct xdp_md *ctx)
 
         memcpy(&src_ip6, iph6->saddr.in6_u.u6_addr32, sizeof(src_ip6));
     }
-    else
-    {
-        iph = data + sizeof(struct ethhdr);
-
-        if (unlikely(iph + 1 > (struct iphdr *)data_end))
-        {
-            inc_pkt_stats(stats, STATS_TYPE_DROPPED);
-
-            return XDP_DROP;
-        }
-    }
+#endif
     
     // We only want to process TCP, UDP, and ICMP packets.
     if ((iph6 && iph6->nexthdr != IPPROTO_UDP && iph6->nexthdr != IPPROTO_TCP && iph6->nexthdr != IPPROTO_ICMP) && (iph && iph->protocol != IPPROTO_UDP && iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_ICMP))
@@ -98,28 +104,32 @@ int xdp_prog_main(struct xdp_md *ctx)
     // Check block map.
     u64 *blocked = NULL;
 
-    if (iph6)
-    {
-        blocked = bpf_map_lookup_elem(&map_block6, &src_ip6);
-    }
-    else if (iph)
+    if (iph)
     {
         blocked = bpf_map_lookup_elem(&map_block, &iph->saddr);
     }
+#ifdef ENABLE_IPV6
+    else
+    {
+        blocked = bpf_map_lookup_elem(&map_block6, &src_ip6);
+    }
+#endif
     
     if (blocked != NULL)
     {
         if (*blocked > 0 && now > *blocked)
         {
             // Remove element from map.
-            if (iph6)
-            {
-                bpf_map_delete_elem(&map_block6, &src_ip6);
-            }
-            else if (iph)
+            if (iph)
             {
                 bpf_map_delete_elem(&map_block, &iph->saddr);
             }
+#ifdef ENABLE_IPV6
+            else
+            {
+                bpf_map_delete_elem(&map_block6, &src_ip6);
+            }
+#endif
         }
         else
         {
@@ -162,68 +172,7 @@ int xdp_prog_main(struct xdp_md *ctx)
 
     u8 protocol = 0;
     
-    if (iph6)
-    {
-        protocol = iph6->nexthdr;
-
-        switch (iph6->nexthdr)
-        {
-            case IPPROTO_TCP:
-                // Scan TCP header.
-                tcph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
-
-                // Check TCP header.
-                if (unlikely(tcph + 1 > (struct tcphdr *)data_end))
-                {
-                    inc_pkt_stats(stats, STATS_TYPE_DROPPED);
-
-                    return XDP_DROP;
-                }
-
-                src_port = tcph->source;
-
-#ifdef ENABLE_FILTER_LOGGING
-                dst_port = tcph->dest;
-#endif
-
-                break;
-
-            case IPPROTO_UDP:
-                // Scan UDP header.
-                udph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
-
-                // Check TCP header.
-                if (unlikely(udph + 1 > (struct udphdr *)data_end))
-                {
-                    inc_pkt_stats(stats, STATS_TYPE_DROPPED);
-
-                    return XDP_DROP;
-                }
-
-                src_port = udph->source;
-
-#ifdef ENABLE_FILTER_LOGGING
-                dst_port = udph->dest;
-#endif
-
-                break;
-
-            case IPPROTO_ICMPV6:
-                // Scan ICMPv6 header.
-                icmp6h = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
-
-                // Check ICMPv6 header.
-                if (unlikely(icmp6h + 1 > (struct icmp6hdr *)data_end))
-                {
-                    inc_pkt_stats(stats, STATS_TYPE_DROPPED);
-
-                    return XDP_DROP;
-                }
-
-                break;
-        }
-    }
-    else if (iph)
+    if (iph)
     {
         protocol = iph->protocol;
 
@@ -284,6 +233,69 @@ int xdp_prog_main(struct xdp_md *ctx)
                 break;
         }
     }
+#ifdef ENABLE_IPV6
+    else if (iph6)
+    {
+        protocol = iph6->nexthdr;
+
+        switch (iph6->nexthdr)
+        {
+            case IPPROTO_TCP:
+                // Scan TCP header.
+                tcph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
+
+                // Check TCP header.
+                if (unlikely(tcph + 1 > (struct tcphdr *)data_end))
+                {
+                    inc_pkt_stats(stats, STATS_TYPE_DROPPED);
+
+                    return XDP_DROP;
+                }
+
+                src_port = tcph->source;
+
+#ifdef ENABLE_FILTER_LOGGING
+                dst_port = tcph->dest;
+#endif
+
+                break;
+
+            case IPPROTO_UDP:
+                // Scan UDP header.
+                udph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
+
+                // Check TCP header.
+                if (unlikely(udph + 1 > (struct udphdr *)data_end))
+                {
+                    inc_pkt_stats(stats, STATS_TYPE_DROPPED);
+
+                    return XDP_DROP;
+                }
+
+                src_port = udph->source;
+
+#ifdef ENABLE_FILTER_LOGGING
+                dst_port = udph->dest;
+#endif
+
+                break;
+
+            case IPPROTO_ICMPV6:
+                // Scan ICMPv6 header.
+                icmp6h = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
+
+                // Check ICMPv6 header.
+                if (unlikely(icmp6h + 1 > (struct icmp6hdr *)data_end))
+                {
+                    inc_pkt_stats(stats, STATS_TYPE_DROPPED);
+
+                    return XDP_DROP;
+                }
+
+                break;
+        }
+    }
+#endif
 
 #ifdef ENABLE_FILTERS
     // Update client stats (PPS/BPS).
@@ -304,6 +316,7 @@ int xdp_prog_main(struct xdp_md *ctx)
         update_flow_stats(&flow_pps, &flow_bps, iph->saddr, src_port, protocol, pkt_len, now);
 #endif
     }
+#ifdef ENABLE_IPV6
     else if (iph6)
     {
 #ifdef ENABLE_RL_IP
@@ -315,6 +328,7 @@ int xdp_prog_main(struct xdp_md *ctx)
 #endif
     }
 #endif
+#endif
 #endif
 
     int action = 0;
@@ -358,8 +372,76 @@ int xdp_prog_main(struct xdp_md *ctx)
         }
 #endif
 
-        // Do specific IPv6.
-        if (iph6)
+        // Match IP settings.
+        if (iph)
+        {
+            // Source address.
+            if (filter->ip.src_ip)
+            {
+                if (filter->ip.src_cidr == 32 && iph->saddr != filter->ip.src_ip)
+                {
+                    continue;
+                }
+
+                if (!is_ip_in_range(iph->saddr, filter->ip.src_ip, filter->ip.src_cidr))
+                {
+                    continue;
+                }
+            }
+
+            // Destination address.
+            if (filter->ip.dst_ip)
+            {
+                if (filter->ip.dst_cidr == 32 && iph->daddr != filter->ip.dst_ip)
+                {
+                    continue;
+                }
+                
+                if (!is_ip_in_range(iph->daddr, filter->ip.dst_ip, filter->ip.dst_cidr))
+                {
+                    continue;
+                }
+            }
+
+#if defined(ENABLE_IPV6) && defined(ALLOW_SINGLE_IP_V4_V6)
+            if ((filter->ip.src_ip6[0] != 0 || filter->ip.src_ip6[1] != 0 || filter->ip.src_ip6[2] != 0 || filter->ip.src_ip6[3] != 0) || (filter->ip.dst_ip6[0] != 0 || filter->ip.dst_ip6[1] != 0 || filter->ip.dst_ip6[2] != 0 || filter->ip.dst_ip6[3] != 0))
+            {
+                continue;
+            }
+#endif
+
+            // TOS.
+            if (filter->ip.do_tos && filter->ip.tos != iph->tos)
+            {
+                continue;
+            }
+
+            // Max TTL.
+            if (filter->ip.do_max_ttl && filter->ip.max_ttl < iph->ttl)
+            {
+                continue;
+            }
+
+            // Min TTL.
+            if (filter->ip.do_min_ttl && filter->ip.min_ttl > iph->ttl)
+            {
+                continue;
+            }
+
+            // Max packet length.
+            if (filter->ip.do_max_len && filter->ip.max_len < pkt_len)
+            {
+                continue;
+            }
+
+            // Min packet length.
+            if (filter->ip.do_min_len && filter->ip.min_len > pkt_len)
+            {
+                continue;
+            }
+        }
+#ifdef ENABLE_IPV6
+        else if (iph6)
         {
             // Source address.
             if (filter->ip.src_ip6[0] != 0 && (iph6->saddr.in6_u.u6_addr32[0] != filter->ip.src_ip6[0] || iph6->saddr.in6_u.u6_addr32[1] != filter->ip.src_ip6[1] || iph6->saddr.in6_u.u6_addr32[2] != filter->ip.src_ip6[2] || iph6->saddr.in6_u.u6_addr32[3] != filter->ip.src_ip6[3]))
@@ -404,75 +486,9 @@ int xdp_prog_main(struct xdp_md *ctx)
                 continue;
             }
         }
-        else if (iph)
-        {
-            // Source address.
-            if (filter->ip.src_ip)
-            {
-                if (filter->ip.src_cidr == 32 && iph->saddr != filter->ip.src_ip)
-                {
-                    continue;
-                }
-
-                if (!is_ip_in_range(iph->saddr, filter->ip.src_ip, filter->ip.src_cidr))
-                {
-                    continue;
-                }
-            }
-
-            // Destination address.
-            if (filter->ip.dst_ip)
-            {
-                if (filter->ip.dst_cidr == 32 && iph->daddr != filter->ip.dst_ip)
-                {
-                    continue;
-                }
-                
-                if (!is_ip_in_range(iph->daddr, filter->ip.dst_ip, filter->ip.dst_cidr))
-                {
-                    continue;
-                }
-            }
-
-#ifdef ALLOW_SINGLE_IP_V4_V6
-            if ((filter->ip.src_ip6[0] != 0 || filter->ip.src_ip6[1] != 0 || filter->ip.src_ip6[2] != 0 || filter->ip.src_ip6[3] != 0) || (filter->ip.dst_ip6[0] != 0 || filter->ip.dst_ip6[1] != 0 || filter->ip.dst_ip6[2] != 0 || filter->ip.dst_ip6[3] != 0))
-            {
-                continue;
-            }
 #endif
 
-            // TOS.
-            if (filter->ip.do_tos && filter->ip.tos != iph->tos)
-            {
-                continue;
-            }
-
-            // Max TTL.
-            if (filter->ip.do_max_ttl && filter->ip.max_ttl < iph->ttl)
-            {
-                continue;
-            }
-
-            // Min TTL.
-            if (filter->ip.do_min_ttl && filter->ip.min_ttl > iph->ttl)
-            {
-                continue;
-            }
-
-            // Max packet length.
-            if (filter->ip.do_max_len && filter->ip.max_len < pkt_len)
-            {
-                continue;
-            }
-
-            // Min packet length.
-            if (filter->ip.do_min_len && filter->ip.min_len > pkt_len)
-            {
-                continue;
-            }
-        }
-
-        // Do TCP options.
+        // Check TCP matches.
         if (filter->tcp.enabled)
         {
             if (!tcph)
@@ -550,6 +566,7 @@ int xdp_prog_main(struct xdp_md *ctx)
                 continue;
             }
         }
+        // Check UDP matches.
         else if (filter->udp.enabled)
         {
             if (!udph)
@@ -595,6 +612,7 @@ int xdp_prog_main(struct xdp_md *ctx)
                     continue;
                 }  
             }
+#ifdef ENABLE_IPV6
             else if (icmp6h)
             {
                 // Code.
@@ -609,10 +627,7 @@ int xdp_prog_main(struct xdp_md *ctx)
                     continue;
                 }
             }
-            else
-            {
-                continue;
-            }
+#endif
         }
 
 #ifdef ENABLE_FILTER_LOGGING
@@ -643,14 +658,16 @@ matched:
         {
             u64 new_time = now + (block_time * NANO_TO_SEC);
             
-            if (iph6)
-            {
-                bpf_map_update_elem(&map_block6, &src_ip6, &new_time, BPF_ANY);
-            }
-            else if (iph)
+            if (iph)
             {
                 bpf_map_update_elem(&map_block, &iph->saddr, &new_time, BPF_ANY);
             }
+#ifdef ENABLE_IPV6
+            else
+            {
+                bpf_map_update_elem(&map_block6, &src_ip6, &new_time, BPF_ANY);
+            }
+#endif      
         }
 
         inc_pkt_stats(stats, STATS_TYPE_DROPPED);
diff --git a/src/xdp/utils/logging.c b/src/xdp/utils/logging.c
index aa7590b..c76f315 100644
--- a/src/xdp/utils/logging.c
+++ b/src/xdp/utils/logging.c
@@ -36,11 +36,14 @@ static __always_inline int log_filter_msg(struct iphdr* iph, struct ipv6hdr* iph
         {
             e->src_ip = iph->saddr;
             e->dst_ip = iph->daddr;
-        } else if (iph6)
+        }
+#ifdef ENABLE_IPV6
+        else if (iph6)
         {
             memcpy(&e->src_ip6, iph6->saddr.in6_u.u6_addr32, 4);
             memcpy(&e->dst_ip6, iph6->daddr.in6_u.u6_addr32, 4);
         }
+#endif
 
         e->src_port = src_port;
         e->dst_port = dst_port;
diff --git a/src/xdp/utils/maps.h b/src/xdp/utils/maps.h
index ab3773e..db45a18 100644
--- a/src/xdp/utils/maps.h
+++ b/src/xdp/utils/maps.h
@@ -21,6 +21,7 @@ struct
     __type(value, u64);
 } map_block SEC(".maps");
 
+#ifdef ENABLE_IPV6
 struct 
 {
     __uint(type, BPF_MAP_TYPE_LRU_HASH);
@@ -28,6 +29,7 @@ struct
     __type(key, u128);
     __type(value, u64);
 } map_block6 SEC(".maps");
+#endif
 
 #ifdef ENABLE_IP_RANGE_DROP
 struct
@@ -50,6 +52,7 @@ struct
     __type(value, cl_stats_t);
 } map_ip_stats SEC(".maps");
 
+#ifdef ENABLE_IPV6
 struct 
 {
     __uint(type, BPF_MAP_TYPE_LRU_HASH);
@@ -58,6 +61,7 @@ struct
     __type(value, cl_stats_t);
 } map_ip6_stats SEC(".maps");
 #endif
+#endif
 
 #ifdef ENABLE_RL_FLOW
 struct 
@@ -68,6 +72,7 @@ struct
     __type(value, cl_stats_t);
 } map_flow_stats SEC(".maps");
 
+#ifdef ENABLE_IPV6
 struct 
 {
     __uint(type, BPF_MAP_TYPE_LRU_HASH);
@@ -76,6 +81,7 @@ struct
     __type(value, cl_stats_t);
 } map_flow6_stats SEC(".maps");
 #endif
+#endif
 
 struct 
 {
diff --git a/src/xdp/utils/rl.c b/src/xdp/utils/rl.c
index 50d169f..c267620 100644
--- a/src/xdp/utils/rl.c
+++ b/src/xdp/utils/rl.c
@@ -55,6 +55,7 @@ static __always_inline int update_ip_stats(u64 *pps, u64 *bps, u32 ip, u16 pkt_l
     return 0;
 }
 
+#ifdef ENABLE_IPV6
 /**
  * Updates source IPv6 address stats.
  * 
@@ -107,6 +108,7 @@ static __always_inline int update_ip6_stats(u64 *pps, u64 *bps, u128 *ip, u16 pk
     return 0;
 }
 #endif
+#endif
 
 #ifdef ENABLE_RL_FLOW
 /**
@@ -168,6 +170,7 @@ static __always_inline int update_flow_stats(u64 *pps, u64 *bps, u32 ip, u16 por
     return 0;
 }
 
+#ifdef ENABLE_IPV6
 /**
  * Updates IPv6 flow stats.
  * 
@@ -227,4 +230,5 @@ static __always_inline int update_flow6_stats(u64 *pps, u64 *bps, u128 *ip, u16
     return 0;
 }
 #endif
+#endif
 #endif
\ No newline at end of file