Hardware Address
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... message type.
1 = BOOTREQUEST, 2 = BOOTREPLY
htype 1 Hardware address type. Set to value 31.
signifying an IPsec tunnel mode virtual interface ...
... IPsec tunnel mode virtual interface.
hlen 1 Hardware address length
hops 1 Client sets to zero, optionally used by relay agents ...
... relay agent.
chaddr 16 Client hardware address. Should be unique.
sname 64 Optional server host name, null terminated string.
...