Dynamic DNS and firewall access
Sally Tomasevic
st1225 at salmar.com
Wed Feb 2 22:05:58 UTC 2000
Hello everyone,
I have an interesting little problem I'm hoping someone can help me out
with. I have a few remote PCs that for which I want to provide remote
access into one of our other systems. I've set up Dynamic DNS so that
they can do remote updates, but the local /etc/hosts.allow file still
blocks them despite the fact that I allow access to the dymamic domain.
For instance. Say dynamic address 111.222.333.444 get updated via dynamic
DNS to be albert.dyn.mydomain.com. My hosts.allow file has this entry.
in.telnetd: albert.dyn.mydomain.com
This, of course, doesn't work and is no big surprise. The problem, as I
see it, seems to be that Linux's anti-spoofing software is rejecting this
address, or the gethostbyname() resolution happens first on the number
111.222.333.444 before it has a chance to look up the domain. This seems
to be the likely culprit.
Questions. Is there a way around this? Can I create dynamic reverse
lookup files? Any suggestions on providing a better way to allow access
to notebook clients who always connect using dymanic IP addresses?
Thanks for any and all suggestions.
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