connection-editor: Increase maximum MTU value from 10000 to 65536

The maximum MTU value of 10000 is too low for USB Ethernet, which has a
maximum (for Linux USB gadgets) of 15412 bytes (although the upper limit
is the USB wMaxPacketSize which goes up to 4294967295 bytes):
  linux/drivers/usb/gadget/function/u_ether.c:#define GETHER_MAX_MTU_SIZE 15412

Multiple Intel NICs can use an MTU of 16110 bytes:
  linux/drivers/net/ethernet/intel/e1000/e1000_hw.h:#define MAX_JUMBO_FRAME_SIZE         0x3F00
  linux/drivers/net/ethernet/intel/e1000e/defines.h:#define MAX_JUMBO_FRAME_SIZE    0x3F00
  linux/drivers/net/ethernet/intel/igbvf/defines.h:#define MAX_JUMBO_FRAME_SIZE         0x3F00

The NetworkManager limit is 4294967295 bytes but this is unreasonable
in a typical enivornment because of the memory required for packets of
that size.

The maximum IPv4 and IPv6 (without using Jumbograms) packet size is 65535
bytes so increase the maximum MTU value to 65536 allow full size IP
packets to be used.

There is a corresponding change in gnome-control-center.

https://gitlab.gnome.org/GNOME/network-manager-applet/-/merge_requests/131

6 files changed, 6 insertions, 6 deletions

diff --git a/src/connection-editor/ce-page-bond.ui b/src/connection-editor/ce-page-bond.ui
index 391bceb4..c7c1cb51 100644
--- a/src/connection-editor/ce-page-bond.ui
+++ b/src/connection-editor/ce-page-bond.ui
@@ -58,7 +58,7 @@
     </data>
   </object>
   <object class="GtkAdjustment" id="bond_mtu_adjustment">
-    <property name="upper">10000</property>
+    <property name="upper">65536</property>
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>
diff --git a/src/connection-editor/ce-page-ethernet.ui b/src/connection-editor/ce-page-ethernet.ui
index d41820c2..b63d5dc2 100644
--- a/src/connection-editor/ce-page-ethernet.ui
+++ b/src/connection-editor/ce-page-ethernet.ui
@@ -3,7 +3,7 @@
 <interface domain="nm-applet">
   <requires lib="gtk+" version="3.10"/>
   <object class="GtkAdjustment" id="adjustment1">
-    <property name="upper">10000</property>
+    <property name="upper">65536</property>
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>
diff --git a/src/connection-editor/ce-page-ip-tunnel.ui b/src/connection-editor/ce-page-ip-tunnel.ui
index 649b1a3c..792a6af5 100644
--- a/src/connection-editor/ce-page-ip-tunnel.ui
+++ b/src/connection-editor/ce-page-ip-tunnel.ui
@@ -3,7 +3,7 @@
 <interface domain="nm-applet">
   <requires lib="gtk+" version="3.10"/>
   <object class="GtkAdjustment" id="adjustment1">
-    <property name="upper">10000</property>
+    <property name="upper">65536</property>
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>
diff --git a/src/connection-editor/ce-page-team.ui b/src/connection-editor/ce-page-team.ui
index fff0a056..7372fe61 100644
--- a/src/connection-editor/ce-page-team.ui
+++ b/src/connection-editor/ce-page-team.ui
@@ -151,7 +151,7 @@
     <property name="page_increment">10</property>
   </object>
   <object class="GtkAdjustment" id="team_mtu_adjustment">
-    <property name="upper">10000</property>
+    <property name="upper">65536</property>
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>
diff --git a/src/connection-editor/ce-page-vlan.ui b/src/connection-editor/ce-page-vlan.ui
index f1dcb57b..4911a051 100644
--- a/src/connection-editor/ce-page-vlan.ui
+++ b/src/connection-editor/ce-page-vlan.ui
@@ -3,7 +3,7 @@
 <interface domain="nm-applet">
   <requires lib="gtk+" version="3.10"/>
   <object class="GtkAdjustment" id="adjustment2">
-    <property name="upper">10000</property>
+    <property name="upper">65536</property>
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>
diff --git a/src/connection-editor/ce-page-wifi.ui b/src/connection-editor/ce-page-wifi.ui
index 9f81b065..aaa84348 100644
--- a/src/connection-editor/ce-page-wifi.ui
+++ b/src/connection-editor/ce-page-wifi.ui
@@ -3,7 +3,7 @@
 <interface domain="nm-applet">
   <requires lib="gtk+" version="3.10"/>
   <object class="GtkAdjustment" id="adjustment1">
-    <property name="upper">10000</property>
+    <property name="upper">65536</property>
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>