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The path MTU is currently hardcoded to 1460 bytes, which fails to allow space for TCP options. Sending a maximum-sized datagram (which is viable when using HTTP POST) will therefore fail since the Ethernet MTU will be exceeded. Reduce the hardcoded path MTU to produce a maximum datagram of 1280 bytes, which is the size required of data link layers by IPv6. It is a reasonable assumption that all intermediary data link layers will be able to convey this packet without fragmentation, even for IPv4. Note that this reduction has a minimal impact upon download throughput, since it affects only the transmit data path. Originally-fixed-by: Suresh Sundriyal <ssundriy@vmware.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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