[lxc-devel] [lxd/master] lxd/network: Push MTU over DHCP

[stgraber on Github]

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From 24403022dcf9aea6ba0de2932bff7e01c470221f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Graber?= <stgraber at ubuntu.com>
Date: Fri, 10 Apr 2020 21:55:19 -0400
Subject: [PATCH] lxd/network: Push MTU over DHCP
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Signed-off-by: Stéphane Graber <stgraber at ubuntu.com>
---
 lxd/network/network.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lxd/network/network.go b/lxd/network/network.go
index 3510bec05a..7e399e1636 100644
--- a/lxd/network/network.go
+++ b/lxd/network/network.go
@@ -433,6 +433,10 @@ func (n *Network) setup(oldConfig map[string]string) error {
 				dnsmasqCmd = append(dnsmasqCmd, fmt.Sprintf("--dhcp-option=3,%s", n.config["ipv4.dhcp.gateway"]))
 			}
 
+			if mtu != "1500" {
+				dnsmasqCmd = append(dnsmasqCmd, fmt.Sprintf("--dhcp-option-force=26,%s", mtu))
+			}
+
 			expiry := "1h"
 			if n.config["ipv4.dhcp.expiry"] != "" {
 				expiry = n.config["ipv4.dhcp.expiry"]