Bug #16823: VXLAN interfaces are configured with an incorrect MTU after re-saving their parent interface - pfSense Plus - pfSense bugtracker

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Bug #16823

open

VXLAN interfaces are configured with an incorrect MTU after re-saving their parent interface

Added by Jake Hackl about 2 months ago. Updated about 14 hours ago.

Status:

Feedback

Priority:

Normal

Assignee:

Marcos M

Category:

Interfaces

Target version:

26.07

Start date:

Due date:

% Done:

100%

Estimated time:

Release Notes:

Default

Affected Plus Version:

Affected Architecture:

Description

When a VXLAN interface is inside a bridge it should inherit the bridges mtu and it does under settings and on creation, however seemingly randomly and always on reboot it will reset to 1450. The interface can be fixed by manually saving it and applying it within the webui.

https://forum.netgate.com/topic/200196/vxlan-over-wireguard.-unexpected-mtu-reset-bug-pfsense

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Updated by Marcos M 7 days ago

Status changed from New to Feedback
Assignee set to Marcos M
Target version set to 26.07
% Done changed from 0 to 100

Applied with 4c7bfab890cabea81bd46ec560f1607f73b5983e. Patch: Show Hide

diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index 9f04453019..7ac56a43a1 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -1501,7 +1501,19 @@ function interface_vxlan_configure(&$vxlan, $vxlankey = "", $flush = true) {
         get_interface_arr(true);
     }

-    interfaces_bring_up($vxlanif);
+    $parent_bridge = false;
+    foreach (config_get_path('interfaces', []) as $id => $interface_config) {
+        if ($interface_config['if'] != $vxlanif) {
+            continue;
+        }
+        $parent_bridge = link_interface_to_bridge($id);
+        break;
+    }
+    if ($parent_bridge) {
+        interface_bridge_add_member($parent_bridge, $vxlanif);
+    } else {
+        interfaces_bring_up($vxlanif);
+    }

     return $vxlanif;
 }

Tested with the following interface configuration:

wan: "WAN" assigned to vmx0
lan: "LAN" assigned to vmx1
opt1: "BRIDGE" (MTU 1370) assigned to bridge0 with members opt3 and opt4
opt2: "WG" (MTU 1400) assigned to tun_wg0
opt3: "VXLAN" assigned to vxlan0 with parent opt2
opt4: "VLAN200" assigned to vmx1.200

Saving and Applying each assigned interface resulted in the correct MTU each time.

For reference: Show Hide

# Saving and applying WG
interface_bridge_add_member('bridge0', 'vxlan0') at /etc/inc/interfaces.inc:1513
interface_vxlan_configure(array(10), 0)
array_walk(array(1), 'interface_vxlan_configure') at /etc/inc/interfaces.inc:4681
interface_configure('opt2', true) at /usr/local/www/interfaces.php:477

# Saving and applying VXLAN
interface_bridge_add_member('bridge0', 'vxlan0') at /etc/inc/interfaces.inc:4662
interface_configure('opt3', true) at /usr/local/www/interfaces.php:477

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Updated by Marcos M 7 days ago

Subject changed from VXLAN over wireguard inside a bridge causes the MTU to reset periodically to 1450 to VXLAN interfaces are configured with the incorrect MTU after resaving their parent interface
Description updated (diff)

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Updated by Jim Pingle about 14 hours ago

Subject changed from VXLAN interfaces are configured with the incorrect MTU after resaving their parent interface to VXLAN interfaces are configured with an incorrect MTU after re-saving their parent interface

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Bug #16823

VXLAN interfaces are configured with an incorrect MTU after re-saving their parent interface

Updated by Marcos M 7 days ago

Updated by Marcos M 7 days ago

Updated by Jim Pingle about 14 hours ago