RESOLV.CONF on OpenWRT: Difference between revisions
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===== Introduction ===== | =====Introduction===== | ||
The resolv.conf file is a plain text file that contains DNS Server IP Address used for Name Resolution: [[wikipedia:Resolv.conf|resolv.conf - Wikipedia]] Unlike most Linux based systems where the resolv.conf file is manually configured, in OpenWRT it is dynamically generated. | |||
With the default install of OpenWRT, the resolv.conf file is automatically generated during boot up and place here: /tmp (Full Path: /tmp/resolv.conf.auto | With the default install of OpenWRT, the resolv.conf file is automatically generated during boot up and place here: /tmp (Full Path: /tmp/resolv.conf.auto | ||
And now you might be saying, "...wait a minute, resolv.conf and resolv.conf.auto, is there a typo there? Nope. Here's what happens when OpenWRT boots up; | And now you might be saying, "...wait a minute, resolv.conf and resolv.conf.auto, is there a typo there? Nope. Here's what happens when OpenWRT boots up; | ||
* /tmp/resolv.conf.auto is created during bootup from the DNS Servers configured for each interface (IE, if the WAN interface has a single DNS Server defined, the /tmp/resolv.conf.auto file will have one entry, if there are two DNS Servers defined for the WAN interface the same /tmp/resolv.conf.auto file will have two entries, if there are two WAN interfaces all of their DNS Servers will be included in the /tmp/resolve.conf.auto file, etc.) | */tmp/resolv.conf.auto is created during bootup from the DNS Servers configured for each interface (IE, if the WAN interface has a single DNS Server defined, the /tmp/resolv.conf.auto file will have one entry, if there are two DNS Servers defined for the WAN interface the same /tmp/resolv.conf.auto file will have two entries, if there are two WAN interfaces all of their DNS Servers will be included in the /tmp/resolve.conf.auto file, etc.) | ||
* A Symbolic Link is created as follows: /tmp/resolv.conf → | *A Symbolic Link is created as follows: /tmp/resolv.conf → /tmp/resolv.conf.auto (Command Equivalent: ln -s /tmp/resolv.conf.auto /tmp/resolv.conf) | ||
*Another Symbolic Link is created as follows: /etc/resolv.conf → /tmp/resolv.conf (Command Equivalent: ln -s /tmp/resolv.conf /etc/resolv.conf) | |||
So the result is /etc/resolv.conf is a Symbolic Link that eventually points to /tmp/resolv.conf.auto through another Symbolic Link /tmp/resolv.conf | |||
Various software such as DNSMASQ manipulates the settings in the resolv.conf file | |||
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