diff --git a/src/main/java/ru/serega6531/packmate/model/Packet.java b/src/main/java/ru/serega6531/packmate/model/Packet.java
index 54a52b8..8d3c7ee 100644
--- a/src/main/java/ru/serega6531/packmate/model/Packet.java
+++ b/src/main/java/ru/serega6531/packmate/model/Packet.java
@@ -32,7 +32,7 @@ public class Packet {
     private Long tempId;
 
     @Transient
-    private byte ttl;
+    private int ttl;
 
     @ManyToOne
     @JoinColumn(name = "stream_id", nullable = false)
diff --git a/src/main/java/ru/serega6531/packmate/model/Stream.java b/src/main/java/ru/serega6531/packmate/model/Stream.java
index ef83b14..ad48d1b 100644
--- a/src/main/java/ru/serega6531/packmate/model/Stream.java
+++ b/src/main/java/ru/serega6531/packmate/model/Stream.java
@@ -46,7 +46,8 @@ public class Stream {
 
     private boolean favorite;
 
-    private byte ttl;
+    @Column(columnDefinition = "smallint")
+    private int ttl;
 
     @Column(columnDefinition = "char(3)")
     private String userAgentHash;
diff --git a/src/main/java/ru/serega6531/packmate/model/pojo/StreamDto.java b/src/main/java/ru/serega6531/packmate/model/pojo/StreamDto.java
index 74e4a52..692d8d8 100644
--- a/src/main/java/ru/serega6531/packmate/model/pojo/StreamDto.java
+++ b/src/main/java/ru/serega6531/packmate/model/pojo/StreamDto.java
@@ -15,7 +15,7 @@ public class StreamDto {
     private long endTimestamp;
     private Set<PatternDto> foundPatterns;
     private boolean favorite;
-    private byte ttl;
+    private int ttl;
     private String userAgentHash;
 
 }
diff --git a/src/main/java/ru/serega6531/packmate/pcap/AbstractPcapWorker.java b/src/main/java/ru/serega6531/packmate/pcap/AbstractPcapWorker.java
index d6a6536..8c1362a 100644
--- a/src/main/java/ru/serega6531/packmate/pcap/AbstractPcapWorker.java
+++ b/src/main/java/ru/serega6531/packmate/pcap/AbstractPcapWorker.java
@@ -53,7 +53,7 @@ public abstract class AbstractPcapWorker implements PcapWorker, PacketListener {
     private final SetMultimap<UnfinishedStream, ImmutablePair<Inet4Address, Integer>> fins = HashMultimap.create();
     private final SetMultimap<UnfinishedStream, ImmutablePair<Inet4Address, Integer>> acks = HashMultimap.create();
 
-    public AbstractPcapWorker(ServicesService servicesService,
+    protected AbstractPcapWorker(ServicesService servicesService,
                               StreamService streamService,
                               String localIpString) throws UnknownHostException {
         this.servicesService = servicesService;
@@ -87,7 +87,7 @@ public abstract class AbstractPcapWorker implements PcapWorker, PacketListener {
         final IpV4Packet.IpV4Header ipHeader = rawPacket.get(IpV4Packet.class).getHeader();
         Inet4Address sourceIp = ipHeader.getSrcAddr();
         Inet4Address destIp = ipHeader.getDstAddr();
-        byte ttl = ipHeader.getTtl();
+        int ttl = Byte.toUnsignedInt(ipHeader.getTtl());
 
         final TcpPacket packet = rawPacket.get(TcpPacket.class);
         final TcpPacket.TcpHeader tcpHeader = packet.getHeader();
@@ -127,7 +127,7 @@ public abstract class AbstractPcapWorker implements PcapWorker, PacketListener {
         final IpV4Packet.IpV4Header ipHeader = rawPacket.get(IpV4Packet.class).getHeader();
         Inet4Address sourceIp = ipHeader.getSrcAddr();
         Inet4Address destIp = ipHeader.getDstAddr();
-        byte ttl = ipHeader.getTtl();
+        int ttl = Byte.toUnsignedInt(ipHeader.getTtl());
 
         final UdpPacket packet = rawPacket.get(UdpPacket.class);
         final UdpPacket.UdpHeader udpHeader = packet.getHeader();
@@ -159,7 +159,7 @@ public abstract class AbstractPcapWorker implements PcapWorker, PacketListener {
     }
 
     private UnfinishedStream addNewPacket(Inet4Address sourceIp, Inet4Address destIp, long time,
-                                          int sourcePort, int destPort, byte ttl, byte[] content, Protocol protocol) {
+                                          int sourcePort, int destPort, int ttl, byte[] content, Protocol protocol) {
         var incoming = destIp.equals(localIp);
         var stream = new UnfinishedStream(sourceIp, destIp, sourcePort, destPort, protocol);
 
diff --git a/src/main/java/ru/serega6531/packmate/service/StreamService.java b/src/main/java/ru/serega6531/packmate/service/StreamService.java
index d332a5f..1e8c67c 100644
--- a/src/main/java/ru/serega6531/packmate/service/StreamService.java
+++ b/src/main/java/ru/serega6531/packmate/service/StreamService.java
@@ -94,7 +94,7 @@ public class StreamService {
 
         final Stream stream = new Stream();
         stream.setProtocol(unfinishedStream.getProtocol());
-        stream.setTtl(firstIncoming.isPresent() ? firstIncoming.get().getTtl() : 0);
+        stream.setTtl(firstIncoming.map(Packet::getTtl).orElse(0));
         stream.setStartTimestamp(packets.get(0).getTimestamp());
         stream.setEndTimestamp(packets.get(packets.size() - 1).getTimestamp());
         stream.setService(service.getPort());