Try iptables -t mangle -L, by default iptables -L only lists rules from table filter, but you modified mangle.
BTW, I was suggested to install iptables-mod-ipopt in [MT300] TTL override doesn't work in 4.5.0 - #4 by pan.li
Try iptables -t mangle -L, by default iptables -L only lists rules from table filter, but you modified mangle.
BTW, I was suggested to install iptables-mod-ipopt in [MT300] TTL override doesn't work in 4.5.0 - #4 by pan.li