13. System-Dependent Wierdnesses

13.1 Solaris

select()

select(2) won't handle more than 1024 file descriptors. Compile with -DUSE_POLL if you need more than 1024 descriptors.

malloc

libmalloc.a is leaky. Squid's configure does not use -lmalloc on Solaris.

DNS lookups and nscd

by David J N Begley.

DNS lookups can be slow because of some mysterious thing called ncsd. You should edit /etc/nscd.conf and make it say: enable-cache hosts no

Apparently nscd serialises DNS queries thus slowing everything down when an application (such as Squid) hits the resolver hard. You may notice something similar if you run a log processor executing many DNS resolver queries - the resolver starts to slow.. right.. down.. . . .

DNS lookups and /etc/nsswitch.conf

by Jason Armistead.

The /etc/nsswitch.conf file determines the order of searches for lookups (amongst other things). You might only have it set up to allow NIS and HOSTS files to work. You definately want the "hosts:" line to include the word dns, e.g.: hosts: nis dns [NOTFOUND=return] files

13.2 FreeBSD

T/TCP bugs

We have found that with FreeBSD-2.2.2-RELEASE, there some bugs with T/TCP. FreeBSD will try to use T/TCP if you've enabled the ``TCP Extensions.'' To disable T/TCP, use sysinstall and disable TCP Extensions, or add this to your /etc/rc files: sysctl -w net.inet.tcp.rfc1644=0

13.3 OSF1/3.2

13.4 BSD/OS

gcc/yacc

If you get ``yacc'' errors, you need to upgrade your GCC installation to a more recent version, at least 2.7.2.

13.5 Linux

Cannot bind socket FD 5 to 127.0.0.1:0: (49) Can't assign requested address

Try a different version of Linux.