02-02-2020
That's a secret that nobody could solve in over a decade. Why do Windows DNS servers return SERVFAIL rather than NXDOMAIN?
IMHO a severe bug. Effectively it disables the caching of an unsuccessful host lookup; makes a performance difference, especially with a thousand DNS clients that run buggy software. But the customer insisted on Windows DNS.
Perhaps somebody here has a solution by chance. Otherwise this is a question for a Windows forum...
Okay, a mitigation I can offer: have the non-Windows nameserver first in /etc/resolv. conf
Last edited by MadeInGermany; 02-02-2020 at 09:39 AM..
Reason: typo
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squid(8) System Manager's Manual squid(8)
NAME
squid - proxy caching server
SYNOPSIS
squid [ -dhisrvzCDFNRVYX ] [ -l facility ] [ -f config-file ] [ -[ au ] port ] [ -k signal ] [ -n service-name ] [ -O cmd-line ]
DESCRIPTION
squid is a high-performance proxy caching server for web clients, supporting FTP, gopher, and HTTP data objects. Unlike traditional
caching software, squid handles all requests in a single, non-blocking, I/O-driven process.
squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups, supports non-blocking DNS lookups, and implements nega-
tive caching of failed requests.
squid supports SSL, extensive access controls, and full request logging. By using the lightweight Internet Cache Protocol, squid caches
can be arranged in a hierarchy or mesh for additional bandwidth savings.
squid consists of a main server program squid, a Domain Name System lookup program dnsserver, some optional programs for rewriting requests
and performing authentication, and some management and client tools. When squid starts up, it spawns a configurable number of dnsserver
processes, each of which can perform a single, blocking Domain Name System (DNS) lookup. This reduces the amount of time the cache waits
for DNS lookups.
squid is derived from the ARPA-funded Harvest Project http://harvest.cs.colorado.edu/
This manual page only lists the command line arguments. For details on how to configure squid see the file /etc/squid/squid.conf, the
Squid FAQ and the documentation at the squid home page http://www.squid-cache.org
OPTIONS
-a port
Specify HTTP port number where Squid should listen for requests, in addition to any http_port specifications in squid.conf.
-d level
Write debugging to stderr also.
-f file
Use the given config-file instead of /etc/squid/squid.conf. If the file name starts with a ! or | then it is assumed to be an
external command or command line. Can for example be used to pre-process the configuration before it is being read by Squid. To
facilitate this Squid also understands the common #line notion to indicate the real source file.
-h Print help message.
-i Install as a Windows Service (see -n option).
-k reconfigure | rotate | shutdown | interrupt | kill | debug | check | parse
Parse configuration file, then send signal to running copy (except -k parse) and exit.
-n name
Specify Windows Service name to use for service operations, default is: Squid
-r Remove a Windows Service (see -n option).
-s Enable logging to syslog.
-l facility
Use specified syslog facility. implies -s
-u port
Specify ICP port number (default: 3130), disable with 0.
-v Print version.
-z Create swap directories
-C Do not catch fatal signals.
-D Disable initial DNS tests.
-F Don't serve any requests until store is rebuilt.
-O options
Set Windows Service Command line options in Registry.
-N No daemon mode.
-R Do not set REUSEADDR on port.
-X Force full debugging.
-Y Only return UDP_HIT or UDP_MISS_NOFETCH during fast reload.
FILES
/etc/squid/squid.conf
The main configuration file. You must initially make changes to this file for squid to work. For example, the default configura-
tion does not allow access from any browser.
/etc/squid/squid.conf.default
Reference copy of the configuration file. Always kept up to date with the version of Squid you are using. Use this to look up con-
figuration syntax after upgrading.
/etc/squid/mime.conf (mime_table)
MIME type mappings for FTP gatewaying
/usr/share/squid/errors/templates (error_directory)
Error page templates
SEE ALSO
cachemgr.cgi(8), pam_auth(8), squid_ldap_auth(8), squid_ldap_group(8), squid_session(8), squid_unix_group(8),
The Squid FAQ
Squid Web Proxy 3.0.STABLE25 squid(8)