diff --git a/doc/language_issues.de b/doc/language_issues.de
index 9168a898b..c72cc40b9 100644
--- a/doc/language_issues.de
+++ b/doc/language_issues.de
@@ -778,12 +778,14 @@ WARNING: untranslated string: info messages = unknown string
 WARNING: untranslated string: interface mode = Interface
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: ipsec interface mode gre = GRE
 WARNING: untranslated string: ipsec interface mode none = - None (Default) -
 WARNING: untranslated string: ipsec interface mode vti = VTI
 WARNING: untranslated string: ipsec mode transport = Transport
 WARNING: untranslated string: ipsec mode tunnel = Tunnel
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: none = none
 WARNING: untranslated string: qos add subclass = Add subclass
diff --git a/doc/language_issues.en b/doc/language_issues.en
index 1e78ec5c2..efc4fce1f 100644
--- a/doc/language_issues.en
+++ b/doc/language_issues.en
@@ -1083,6 +1083,7 @@ WARNING: untranslated string: invalid input for ike lifetime = Invalid input for
 WARNING: untranslated string: invalid input for inactivity timeout = Invalid input for Inactivity Timeout
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for keepalive 1 = Invalid input for Keepalive ping
 WARNING: untranslated string: invalid input for keepalive 1:2 = Invalid input for Keepalive use at least a ratio of 1:2
 WARNING: untranslated string: invalid input for keepalive 2 = Invalid input for Keepalive ping-restart
@@ -1273,6 +1274,7 @@ WARNING: untranslated string: mpfire scanning = Scan for new files
 WARNING: untranslated string: mpfire search = MPFire Search
 WARNING: untranslated string: mpfire songs = MPFire songlist
 WARNING: untranslated string: mpfire webradio = MPFire Webradio
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: my new share = My new share
 WARNING: untranslated string: name = Name
 WARNING: untranslated string: name is invalid = Name is invalid
diff --git a/doc/language_issues.es b/doc/language_issues.es
index 2264ef322..6994a9e92 100644
--- a/doc/language_issues.es
+++ b/doc/language_issues.es
@@ -1056,6 +1056,7 @@ WARNING: untranslated string: invalid input for dpd timeout = Invalid input for
 WARNING: untranslated string: invalid input for inactivity timeout = Invalid input for Inactivity Timeout
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: invalid input for valid till days = Invalid input for Valid till (days).
 WARNING: untranslated string: invalid ip or hostname = Invalid IP Address or Hostname
@@ -1097,6 +1098,7 @@ WARNING: untranslated string: modem sim information = SIM Information
 WARNING: untranslated string: modem status = Modem Status
 WARNING: untranslated string: monitor interface = Monitor Interface
 WARNING: untranslated string: most preferred = most preferred
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: nameserver = Nameserver
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: none = none
diff --git a/doc/language_issues.fr b/doc/language_issues.fr
index b37f5eb62..42ef8d5c7 100644
--- a/doc/language_issues.fr
+++ b/doc/language_issues.fr
@@ -813,6 +813,7 @@ WARNING: untranslated string: info messages = unknown string
 WARNING: untranslated string: interface mode = Interface
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: invalid ip or hostname = Invalid IP Address or Hostname
 WARNING: untranslated string: ipsec interface mode gre = GRE
@@ -820,6 +821,7 @@ WARNING: untranslated string: ipsec interface mode none = - None (Default) -
 WARNING: untranslated string: ipsec interface mode vti = VTI
 WARNING: untranslated string: ipsec mode transport = Transport
 WARNING: untranslated string: ipsec mode tunnel = Tunnel
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: pakfire ago = ago.
 WARNING: untranslated string: route config changed = unknown string
diff --git a/doc/language_issues.it b/doc/language_issues.it
index f2c4765da..04676a985 100644
--- a/doc/language_issues.it
+++ b/doc/language_issues.it
@@ -888,6 +888,7 @@ WARNING: untranslated string: interface mode = Interface
 WARNING: untranslated string: invalid input for inactivity timeout = Invalid input for Inactivity Timeout
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: invalid input for valid till days = Invalid input for Valid till (days).
 WARNING: untranslated string: invalid ip or hostname = Invalid IP Address or Hostname
@@ -905,6 +906,7 @@ WARNING: untranslated string: masquerading = Masquerading
 WARNING: untranslated string: masquerading disabled = Masquerading disabled
 WARNING: untranslated string: masquerading enabled = Masquerading enabled
 WARNING: untranslated string: messages = Messages
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: none = none
 WARNING: untranslated string: one hour = One Hour
diff --git a/doc/language_issues.nl b/doc/language_issues.nl
index 6fd6bd959..22b5f8433 100644
--- a/doc/language_issues.nl
+++ b/doc/language_issues.nl
@@ -902,6 +902,7 @@ WARNING: untranslated string: interface mode = Interface
 WARNING: untranslated string: invalid input for inactivity timeout = Invalid input for Inactivity Timeout
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: invalid input for valid till days = Invalid input for Valid till (days).
 WARNING: untranslated string: invalid ip or hostname = Invalid IP Address or Hostname
@@ -933,6 +934,7 @@ WARNING: untranslated string: modem no connection message = No connection to the
 WARNING: untranslated string: modem sim information = SIM Information
 WARNING: untranslated string: modem status = Modem Status
 WARNING: untranslated string: monitor interface = Monitor Interface
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: nameserver = Nameserver
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: none = none
diff --git a/doc/language_issues.pl b/doc/language_issues.pl
index 2264ef322..6994a9e92 100644
--- a/doc/language_issues.pl
+++ b/doc/language_issues.pl
@@ -1056,6 +1056,7 @@ WARNING: untranslated string: invalid input for dpd timeout = Invalid input for
 WARNING: untranslated string: invalid input for inactivity timeout = Invalid input for Inactivity Timeout
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: invalid input for valid till days = Invalid input for Valid till (days).
 WARNING: untranslated string: invalid ip or hostname = Invalid IP Address or Hostname
@@ -1097,6 +1098,7 @@ WARNING: untranslated string: modem sim information = SIM Information
 WARNING: untranslated string: modem status = Modem Status
 WARNING: untranslated string: monitor interface = Monitor Interface
 WARNING: untranslated string: most preferred = most preferred
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: nameserver = Nameserver
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: none = none
diff --git a/doc/language_issues.ru b/doc/language_issues.ru
index 771395391..869ccd786 100644
--- a/doc/language_issues.ru
+++ b/doc/language_issues.ru
@@ -1058,6 +1058,7 @@ WARNING: untranslated string: invalid input for dpd timeout = Invalid input for
 WARNING: untranslated string: invalid input for inactivity timeout = Invalid input for Inactivity Timeout
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: invalid input for valid till days = Invalid input for Valid till (days).
 WARNING: untranslated string: invalid ip or hostname = Invalid IP Address or Hostname
@@ -1099,6 +1100,7 @@ WARNING: untranslated string: modem sim information = SIM Information
 WARNING: untranslated string: modem status = Modem Status
 WARNING: untranslated string: monitor interface = Monitor Interface
 WARNING: untranslated string: most preferred = most preferred
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: nameserver = Nameserver
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: none = none
diff --git a/doc/language_issues.tr b/doc/language_issues.tr
index 0d5095d6f..c45523441 100644
--- a/doc/language_issues.tr
+++ b/doc/language_issues.tr
@@ -816,6 +816,7 @@ WARNING: untranslated string: info messages = unknown string
 WARNING: untranslated string: interface mode = Interface
 WARNING: untranslated string: invalid input for interface address = Invalid input for interface address
 WARNING: untranslated string: invalid input for interface mode = Invalid input for interface mode
+WARNING: untranslated string: invalid input for interface mtu = Invalid input to interface MTU
 WARNING: untranslated string: invalid input for mode = Invalid input for mode
 WARNING: untranslated string: invalid ip or hostname = Invalid IP Address or Hostname
 WARNING: untranslated string: ipsec interface mode gre = GRE
@@ -823,6 +824,7 @@ WARNING: untranslated string: ipsec interface mode none = - None (Default) -
 WARNING: untranslated string: ipsec interface mode vti = VTI
 WARNING: untranslated string: ipsec mode transport = Transport
 WARNING: untranslated string: ipsec mode tunnel = Tunnel
+WARNING: untranslated string: mtu = MTU
 WARNING: untranslated string: no data = unknown string
 WARNING: untranslated string: ovpn error dh = The Diffie-Hellman parameter needs to be in minimum 2048 bit! <br>Please generate or upload a new Diffie-Hellman parameter, this can be made below in the section "Diffie-Hellman parameters options".</br>
 WARNING: untranslated string: ovpn error md5 = You host certificate uses MD5 for the signature which is not accepted anymore. <br>Please update to the latest IPFire version and generate a new root and host certificate.</br><br>All OpenVPN clients needs then to be renewed!</br>
diff --git a/doc/language_missings b/doc/language_missings
index 54b8e6770..a770c13b2 100644
--- a/doc/language_missings
+++ b/doc/language_missings
@@ -42,12 +42,14 @@
 < interface mode
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < ipsec interface mode gre
 < ipsec interface mode none
 < ipsec interface mode vti
 < ipsec mode transport
 < ipsec mode tunnel
+< mtu
 < none
 < notes
 < qos add subclass
@@ -508,6 +510,7 @@
 < invalid input for inactivity timeout
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < invalid input for valid till days
 < invalid ip or hostname
@@ -552,6 +555,7 @@
 < modem status
 < monitor interface
 < most preferred
+< mtu
 < MTU settings
 < nameserver
 < never
@@ -809,6 +813,7 @@
 < interface mode
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < invalid ip or hostname
 < ipsec interface mode gre
@@ -816,6 +821,7 @@
 < ipsec interface mode vti
 < ipsec mode transport
 < ipsec mode tunnel
+< mtu
 < subnet mask
 ############################################################################
 # Checking cgi-bin translations for language: it                           #
@@ -956,6 +962,7 @@
 < invalid input for inactivity timeout
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < invalid input for valid till days
 < invalid ip or hostname
@@ -973,6 +980,7 @@
 < masquerading disabled
 < masquerading enabled
 < messages
+< mtu
 < MTU settings
 < none
 < Number of Countries for the pie chart
@@ -1203,6 +1211,7 @@
 < invalid input for inactivity timeout
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < invalid input for valid till days
 < invalid ip or hostname
@@ -1234,6 +1243,7 @@
 < modem sim information
 < modem status
 < monitor interface
+< mtu
 < MTU settings
 < nameserver
 < never
@@ -1771,6 +1781,7 @@
 < invalid input for inactivity timeout
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < invalid input for valid till days
 < invalid ip or hostname
@@ -1815,6 +1826,7 @@
 < modem status
 < monitor interface
 < most preferred
+< mtu
 < MTU settings
 < nameserver
 < never
@@ -2501,6 +2513,7 @@
 < invalid input for inactivity timeout
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < invalid input for valid till days
 < invalid ip or hostname
@@ -2546,6 +2559,7 @@
 < monitor interface
 < month-graph
 < most preferred
+< mtu
 < MTU settings
 < nameserver
 < never
@@ -2789,6 +2803,7 @@
 < interface mode
 < invalid input for interface address
 < invalid input for interface mode
+< invalid input for interface mtu
 < invalid input for mode
 < invalid ip or hostname
 < ipsec interface mode gre
@@ -2796,6 +2811,7 @@
 < ipsec interface mode vti
 < ipsec mode transport
 < ipsec mode tunnel
+< mtu
 < ovpn error dh
 < ovpn error md5
 < ovpn warning rfc3280
diff --git a/html/cgi-bin/vpnmain.cgi b/html/cgi-bin/vpnmain.cgi
index 02284ddf3..e1ec348aa 100644
--- a/html/cgi-bin/vpnmain.cgi
+++ b/html/cgi-bin/vpnmain.cgi
@@ -114,6 +114,7 @@ $cgiparams{'INACTIVITY_TIMEOUT'} = 1800;
 $cgiparams{'MODE'} = "tunnel";
 $cgiparams{'INTERFACE_MODE'} = "";
 $cgiparams{'INTERFACE_ADDRESS'} = "";
+$cgiparams{'INTERFACE_MTU'} = 1500;
 &Header::getcgihash(\%cgiparams, {'wantfile' => 1, 'filevar' => 'FH'});
 
 ###
@@ -1329,6 +1330,7 @@ END
 		$cgiparams{'MODE'}			= $confighash{$cgiparams{'KEY'}}[35];
 		$cgiparams{'INTERFACE_MODE'}		= $confighash{$cgiparams{'KEY'}}[36];
 		$cgiparams{'INTERFACE_ADDRESS'}		= $confighash{$cgiparams{'KEY'}}[37];
+		$cgiparams{'INTERFACE_MTU'}		= $confighash{$cgiparams{'KEY'}}[38];
 
 		if (!$cgiparams{'DPD_DELAY'}) {
 			$cgiparams{'DPD_DELAY'} = 30;
@@ -1828,7 +1830,7 @@ END
 	my $key = $cgiparams{'KEY'};
 	if (! $key) {
 		$key = &General::findhasharraykey (\%confighash);
-		foreach my $i (0 .. 36) { $confighash{$key}[$i] = "";}
+		foreach my $i (0 .. 38) { $confighash{$key}[$i] = "";}
 	}
 	$confighash{$key}[0] = $cgiparams{'ENABLED'};
 	$confighash{$key}[1] = $cgiparams{'NAME'};
@@ -1876,6 +1878,7 @@ END
 	$confighash{$key}[35] = $cgiparams{'MODE'};
 	$confighash{$key}[36] = $cgiparams{'INTERFACE_MODE'};
 	$confighash{$key}[37] = $cgiparams{'INTERFACE_ADDRESS'};
+	$confighash{$key}[38] = $cgiparams{'INTERFACE_MTU'};
 
 	# free unused fields!
 	$confighash{$key}[6] = 'off';
@@ -1953,6 +1956,7 @@ END
 	$cgiparams{'MODE'}        		= "tunnel";
 	$cgiparams{'INTERFACE_MODE'}        	= "";
 	$cgiparams{'INTERFACE_ADDRESS'}        	= "";
+	$cgiparams{'INTERFACE_MTU'}        	= 1500;
 }
 
 VPNCONF_ERROR:
@@ -2012,6 +2016,7 @@ VPNCONF_ERROR:
 	<input type='hidden' name='MODE' value='$cgiparams{'MODE'}' />
 	<input type='hidden' name='INTERFACE_MODE' value='$cgiparams{'INTERFACE_MODE'}' />
 	<input type='hidden' name='INTERFACE_ADDRESS' value='$cgiparams{'INTERFACE_ADDRESS'}' />
+	<input type='hidden' name='INTERFACE_MTU' value='$cgiparams{'INTERFACE_MTU'}' />
 END
 ;
 	if ($cgiparams{'KEY'}) {
@@ -2321,6 +2326,11 @@ if(($cgiparams{'ACTION'} eq $Lang::tr{'advanced'}) ||
 			goto ADVANCED_ERROR;
 		}
 
+		if ($cgiparams{'INTERFACE_MTU'} !~ /^\d+$/) {
+			$errormessage = $Lang::tr{'invalid input for interface mtu'};
+			goto ADVANCED_ERROR;
+		}
+
 		$confighash{$cgiparams{'KEY'}}[29] = $cgiparams{'IKE_VERSION'};
 		$confighash{$cgiparams{'KEY'}}[18] = $cgiparams{'IKE_ENCRYPTION'};
 		$confighash{$cgiparams{'KEY'}}[19] = $cgiparams{'IKE_INTEGRITY'};
@@ -2343,6 +2353,7 @@ if(($cgiparams{'ACTION'} eq $Lang::tr{'advanced'}) ||
 		$confighash{$cgiparams{'KEY'}}[35] = $cgiparams{'MODE'};
 		$confighash{$cgiparams{'KEY'}}[36] = $cgiparams{'INTERFACE_MODE'};
 		$confighash{$cgiparams{'KEY'}}[37] = $cgiparams{'INTERFACE_ADDRESS'};
+		$confighash{$cgiparams{'KEY'}}[38] = $cgiparams{'INTERFACE_MTU'};
 		&General::writehasharray("${General::swroot}/vpn/config", \%confighash);
 		&writeipsecfiles();
 		if (&vpnenabled) {
@@ -2375,6 +2386,7 @@ if(($cgiparams{'ACTION'} eq $Lang::tr{'advanced'}) ||
 		$cgiparams{'MODE'}			= $confighash{$cgiparams{'KEY'}}[35];
 		$cgiparams{'INTERFACE_MODE'}		= $confighash{$cgiparams{'KEY'}}[36];
 		$cgiparams{'INTERFACE_ADDRESS'}		= $confighash{$cgiparams{'KEY'}}[37];
+		$cgiparams{'INTERFACE_MTU'}		= $confighash{$cgiparams{'KEY'}}[38];
 
 		if (!$cgiparams{'DPD_DELAY'}) {
 			$cgiparams{'DPD_DELAY'} = 30;
@@ -2563,6 +2575,10 @@ if(($cgiparams{'ACTION'} eq $Lang::tr{'advanced'}) ||
 					<label>$Lang::tr{'ip address'}/$Lang::tr{'subnet mask'}</label>
 					<input type="text" name="INTERFACE_ADDRESS" value="$cgiparams{'INTERFACE_ADDRESS'}">
 				</td>
+				<td>
+					<label>$Lang::tr{'mtu'}</label>
+					<input type="number" name="INTERFACE_MTU" value="$cgiparams{'INTERFACE_MTU'}" min="576" max="9000">
+				</td>
 			</tr>
 		</tbody>
 	</table>
diff --git a/langs/en/cgi-bin/en.pl b/langs/en/cgi-bin/en.pl
index 6683cb399..d289aa783 100644
--- a/langs/en/cgi-bin/en.pl
+++ b/langs/en/cgi-bin/en.pl
@@ -1429,6 +1429,7 @@
 'invalid input for inactivity timeout' => 'Invalid input for Inactivity Timeout',
 'invalid input for interface address' => 'Invalid input for interface address',
 'invalid input for interface mode' => 'Invalid input for interface mode',
+'invalid input for interface mtu' => 'Invalid input to interface MTU',
 'invalid input for keepalive 1' => 'Invalid input for Keepalive ping',
 'invalid input for keepalive 1:2' => 'Invalid input for Keepalive use at least a ratio of 1:2',
 'invalid input for keepalive 2' => 'Invalid input for Keepalive ping-restart',
@@ -1694,6 +1695,7 @@
 'mpfire search' => 'MPFire Search',
 'mpfire songs' => 'MPFire songlist',
 'mpfire webradio' => 'MPFire Webradio',
+'mtu' => 'MTU',
 'mtu QoS' => 'This does not change the global MTU, it only sets MTU for QoS.',
 'my new share' => 'My new share',
 'name' => 'Name',