[SASAG] bind() interposition tool? (or how to run NTP on my firewall)

branen salmon sasag at nenarb.net
Wed Jun 10 15:14:55 PDT 2009

Hey, folks--

I'm trying to run ntpd on a firewall/router that has some IP addresses 
that ntpd shouldn't be touching.  Sadly, ntpd does not support binding to 
specific addresses [1], but since it does use bind(), I'm wondering if 
there's some sort of interposition tool out there I can use to restrict 
bind to a single IP address.

The initial request for the feature was made in 2003 [2], so I'm not 
holding my breath.  Any recommendations for the interim?



[1] http://support.ntp.org/bin/view/Dev/NtpdAndNetworkSockets
[2] https://support.ntp.org/bugs/show_bug.cgi?id=214

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