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Add explanation for tun packet headers
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@ -521,11 +521,15 @@ write_tun(int tun_fd, char *data, size_t len)
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len -= 4;
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} else {
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#ifdef LINUX
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// Linux prefixes with 32 bits ethertype
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// 0x0800 for IPv4, 0x86DD for IPv6
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x08;
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data[3] = 0x00;
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#else /* OPENBSD and DARWIN(utun) */
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// BSDs prefix with 32 bits address family
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// AF_INET for IPv4, AF_INET6 for IPv6
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data[0] = 0x00;
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data[1] = 0x00;
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data[2] = 0x00;
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