09db410606
Follow-up for 17c5337f7b2993619d84acc2088b2ba1789e6477. Older kernels (older than v6.5) refuse RTM_NEWLINK messages with IFLA_ADDRESS attribute when the netdev already exists and is running, even if the MAC address is unchanged. So, let's not set IFLA_ADDRESS or IFLA_MTU if they are unchanged, and set the attributes only when we can update them.
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