Whenever I SSH somewhere I get something like this in the logs:
sshd: reverse mapping checking getaddrinfo for 126.96.36.199.crummyisp.net [188.8.131.52] failed - POSSIBLE BREAK-IN ATTEMPT!
And it is right: if I do
host 184.108.40.206 it returns
but if I do
host 220.127.116.11.crummyisp.net it is not found.
I have two questions:
What security threat is there? How could anyone fake a one-way DNS in some threatening way?
Do I have any recourse for fixing this? I'll send my ISP a bug report, but who knows where that'll go.