# iptables -t mangle -I PREROUTING -s 8.8.8.8/16 -m ttl --ttl-gt 63 -j DROP
# ip6tables -t mangle -I PREROUTING -s 2001:4860:4860::8844/112 -m hl --hl-gt 52 -j DROP
2015/12/19
Easy way to prevent from GFW DNS abusing
The easiest way to distinguish the GFW DNS abusing result from real DNS responses is using iptables to block the dummy DNS response by GFW
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IPv4 TTL should be less than 50 in CERNET.
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