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Nov 23, 2009

Problem resolving DNS names with Verizon FiOS

by Eric Smith — last modified Nov 24, 2009 05:57 AM

I recently upgraded my FiOS service and had a problem resolving some DNS names. The solution was simple but frustrating.

I've been using Verizon FiOS for Internet service for years. In general I've been pleased with the service: it's very fast and very reliable.

I've been running FiOS without using the Verizon supplied router. Instead, I plugged the incoming CAT5 cable directly into my Linux server. This did require that I use a slightly complicated configuration supporting PPPoE, but once I finally got it set up it has been problem-free. My Linux server has also been my DNS server and my DHCP server. I'm sure Verizon doesn't like this configuration, as it gives them less control over and less visibility into my network. But that's fine with me.

However, I recently switched to using FiOS TV. Because of the way the TV set top boxes (STB's) need to communicate upstream for program information, I'm forced to use the ActionTec router that Verizon supplies. As long as I'm forced to use this router I decided to use a more normal, less techy configuration and just let the ActionTec be my DNS and DHCP server. This has generally worked without issue, at least for the first few days.

Last night I decided to change the default domain name that the router uses. It defaults to "home", but it's better for me if it uses "", that way I can more easily resolve domain names. In any network I've ever worked on, this would not be a problem. The only thing it should affect is that when a client asks for a name like "mail", it would first query for "".

However this morning my home network wasn't able to connect to my mail servers. After a lot of poking around I discovered that my internal systems were not able to resolve fully qualified DNS names like After a lot more poking around, I discovered that the ActionTec would not resolve domain names ending in if its default domain were also

So the solution was simply to change the default domain name on the ActionTec back to "home", or indeed any other string. That's frustrating, because it means that I can't type domain names like "mail", but I need to use the fully qualified "". But it's only a minor frustration. The only time I don't use fully qualified names is when I'm debugging. All of my systems use fully qualified names for their configuration files.

I'll probably switch away from using the ActionTec as my DNS and DHCP servers. In addition to this problem, you're limited in the amount of configuration you have over the DHCP server in particular. I'll post more when I've made the decision to switch off of the ActionTec for DNS and DHCP.