Configuring proxy server on a Synology NASA proxy server can be useful to reduce the number of requests and data when browsing over the internet. Especially when files are downloaded repeatedly, like opening facebook multiple times a day or downloading the same file frequently (updating multiple vm’s). Since I have a Synology NAS I wanted to experiment with a squid proxy and a zero- touch configuration for my clients using WPAD. Step 1 – Squid proxy. First we need to install the squid proxy package on the Synology NAS.

For that we need ipkg. If you haven’t installed ipkg yet, please install it first (link). You can install the package squid in with the command: ipkg install squid. Optionally you can change the size of the disk cache. By default the size of the cache is 1. MB, not really much, so I increased this to 4.

GB. The size of the cache is stored in the parameter cache. The third parameter (4. Then we want to validate the configuration with squid –k parse  and create the temp (or swap directory) with the command squid –z. The startup script is by default not placed in the startup directory of Synology DSM, therefor we create a symbolic link: ln –s /opt/etc/init. S8. 0squid /usr/syno/etc/rc.

This document describes the procedure used in order to calculate the hexadecimal value for the time offset DHCP Option 2 when DHCP pools are configured in Cisco routers. Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) Parameters Last Updated 2016-11-17 Note For the Civic Address Types Registry, please see.

And then we’re ready to start the squid daemon: /opt/etc/init. S8. 0squid start. Congratulations! You know got a operational proxy server All you have to do is configuring you’re client to use the proxy server < fqdn- or- ip- address- of- your- nas> :3. Step 2 – WPADIf you don’t want to configure the FQDN or IP address and port number on each client you can use the Web Proxy Autodiscovery Protocol (WPAD). This is a method used by clients to locate a URL of a configuration URL using DHCP and/or DNS discovery methods.

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Source: wikipedia. The WPAD uses a Java. Script file (named WPAD. DAT) that can direct browsers to the correct proxy server. Since this is a Java.

Script file some intelligence can be used, like excluding certain websites. In this case I’ll use a simple wpad configuration file which always directs the users to my fresly install proxy server. This is done by adding the following line in the file /usr/syno/apache/conf/mime. Now you can configure your browser to use the automatic configuration script. Step 3 – DHCPNow if you’re really lazy and don’t want to configure the location of the wpad configuration file on every client, you can configure WPAD via DHCP or DNS.

The most reliable method is providing the location of the wpad configuration file via a DHCP option. Since we have a Synology NAS, and because we can use this device, we’re using the NAS as a DHCP server. For that we need to install a DHCP package which is an optional package provided by Synology.

Select . If this contains the  message . The configuraton file is stored in the /etc/dhcp/ directory.

Note that the /etc/rc. DHCP server is started. The content of all /etc/dhcpd/dhcpd- *.

Updated on 1. 1- 0. Add the following two files: /etc/dhcpd/dhcpd- server- options. Very important: Add a line feed after the first line (press Enter) otherwise lines will merge in dhcpd. You have to logon with user root, the user admin has insufficient privileges.(Re)start the DHCP server to apply the settings. Now you can configure your browser to detect the automatic configuration. Is it working. You can verify if  you’re using a proxy server by visiting http: //www. Not only will it show you you’re IP address but also if and what proxy server you’re using.

How to use IP helper- address to connect remote DHCP server. Once in a while, I see . For example, communicating between old computers that is using Net. BIOS protocols, connecting remote DHCP server. In this article, we will mainly discuss about how to use IP helper- address to connect a remote DHCP server. The below example might not be realistic, b/c I just made up a case to better understand this technology.

Where do you think the ? Answer is Ethernet interface of New York router.

By default, router drop all the broadcast packtes sent thru the router. Auto Dial Up Connection Software. Because DHCP clients use bootp packets that are broadcasted to all hosts(2. I hope now you get more understand about IP- helper address.