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mueslimak3r/ttl-mods.txt

Last active September 4, 2023 15:04
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ttl mods for mangling TTL behind an LTE modem
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ttl-mods.txt
# iptables rules for mangling ipv4 and ipv6 traffic
# prerouting rules appear to prevent leaks to the ISP
iptables -t mangle -I PREROUTING 1 -j TTL --ttl-set 65
ip6tables -t mangle -I PREROUTING 1 -j HL --hl-set 65
# postrouting rules do the heavy lifting
iptables -t mangle -I POSTROUTING 1 -j TTL --ttl-set 65
ip6tables -t mangle -A POSTROUTING 1 -j HL --hl-set 65
# modem decrements TTL from 65 to 64, which is what the ISP sees :)
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