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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This is a long shot, but if anyone has the time to read
this, I’d appreciate any suggestions!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m running FR 1.x on the same RHEL4 box that handles
POP3/IMAP proxying (using ‘perdition’) and authenticated SMTP
(using sendmail). I’m in the process of migrating from
Funk/Juniper, so my other RADIUS servers are otherwise occupied.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In the same general time frame I’ve been running FR on
this box, we’ve started to notice random timeout problems when sending or
reading mail. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’ve been trying to track this down for a month now,
and I’m fresh out of ideas. The problem is so transient, only lasts
a minute or so, so it’s really hard to get a handle on whats
happening. And its not as simple as it refuses all connections during
that time … it’s like (some) existing sessions get hung up, but new
ones will work. And it doesn’t effect all the people all the time.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The machines has gobs of spare memory (only about 3GB of 8GB
used) and cycles (I don’t think I’ve ever seen the load average go
over 2), even though it is fairly busy with mail. Maybe 40 or 50 concurrent
POP3/IMAP proxy sessions and a dozen or so sendmails. The actual mailbox
server the proxy talks to has similar amounts of headroom.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The RADIUS load is negligible, just a dozen or so sectors of
wireless users doing PPPOE. Call it a couple of dozen queries a minute or
so. MySQL runs on another server, on the same gigabit switch, no network
logjams anywhere. Local iostats show no disk bottlenecks anywhere.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If it makes any difference, I run radiusd in –X mode,
because it crashes when running as a service (valgrind showed Bad Things
happening).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>About the only thing I can think of which the mail and
RADIUS have in common is that they all use PAM/winbind to authenticate against
a Windows AD. I have heard about issues with PAM, mostly reports of
memory leaks, but it has always worked perfectly for me. This box has
been running for about 18 months without a reboot. Until last week, when
I tried the Big Stick approach, but the problem is still there after a reboot.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>My next step is to switch RADIUS over to using ntlm_auth
instead of PAM/winbind. It already does ntlm_auth for MSCHAP requests, it’s
only the plain text that uses PAM. I initially configured it to use PAM
because I couldn’t get ntlm_auth to work outside of MSCHAP, using clear
text, but I may have solved that one.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Anyway … if nothing else, I’ll let you know how
it goes, in case someone with the same problem ever googles into this.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> -- hugh<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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