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Posts Tagged ‘proxy’

How DHCP/DNS Server Works in Web Proxy Autodiscovery Protocol (WPAD) for Today’s Browsers

Web Proxy Autodiscovery Protocol (WPAD) protocol draft expired in 1999, but today’s major browsers are still supporting it as will be shown later. Two types of DHCP server are tested to describe how WPAD behaves prior to/after starting up the internet browser. To be clear, uploaded packet captures are shared in CloudShark. DNS and domain [...]

Running Two Squid Instances in Upstart Init

After installing squid3 from repository, Ubuntu will place the init in upstart style (instead of /etc/rc*.d/ or /etc/init.d/ style used to maintain backward compatibility to legacy System-V init). The upstart job is placed in /etc/init/squid3.conf with default runlevel (2,3,4 or 5) to start the instance during reboot and relevant start/stop command using service: $ sudo [...]

Zabbix Proxy: distributed NMS monitoring via embedded Linux (Ubuntu on BeagleBoard)

As already mentioned in previous post’s introduction, proof of concept on how Zabbix Proxy works under unreliable communication is what this next post about. The idea is to have these scenarios tested: independent SNMP data polling by individual NMS proxy (embedded system) intermittent connection between main/master NMS server with its proxy Of course we’ll do [...]

Compile Zabbix Proxy in Ubuntu ARM (BeagleBoard)

I needed to tackle practical limitation of SNMP monitoring under unreliable communication, a serious consideration was made for Zabbix Proxy. It was an option said to be ready for embedded hardware. I already had BeagleBoard xM Rev C running Ubuntu 11.10 Oneiric and needed to proof that it would port functionally to this Linux ARM [...]

Basic squid In A Gateway

This trial is done in a RedHat (RHEL 5.2) inside VirtualBox. The required squid package is using squid-3.0.STABLE13-1.el5.i386.rpm. Two interfaces is configured in this box as shown in the following NAT masquerading which build a simple router at (eth1) : 1 2 3 4 5 6 7 8 WAN=wan0 LAN=eth1 IPTABLES=/sbin/iptables   $IPTABLES –flush                         [...]