Lennart Poettering
5a0d0b8f9c
Apparently CAN links will show up in rtnetlink with very low MTUs. We shouldn't consider them relevant if no IP is spoken over them, since these MTUs are irrelevant for us then. Hence, let's check if there's an address assigned to the link before considering its MTU. As additional safety net filter out MTUs smaller than the minimum DNS packet size, too. Finally, in case we don't find any suitable interface MTU, let's default to 1500 as the generic Ethernet MTU. Fixes: #19396
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