From 60b4af930e6b326ee1a5915d62fa72fe7ae9947b Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 2 Nov 2021 12:25:12 +0900
Subject: [PATCH] network/veth: also set MTU for peer interface

Fixes #21206.
---
 src/network/netdev/veth.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/network/netdev/veth.c b/src/network/netdev/veth.c
index 840a3277b1..cdbbf39361 100644
--- a/src/network/netdev/veth.c
+++ b/src/network/netdev/veth.c
@@ -34,6 +34,12 @@ static int netdev_veth_fill_message_create(NetDev *netdev, Link *link, sd_netlin
                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
         }
 
+        if (netdev->mtu != 0) {
+                r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
+        }
+
         r = sd_netlink_message_close_container(m);
         if (r < 0)
                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");