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I was just thinking, wouldn't the box need to perform a DNS lookup for &quot;localhost&quot; for some services?
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I was just thinking, wouldn't the box need to perform a DNS lookup for "localhost" for some services?

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Hi,<br />
<br />
I am configuring iptables on my linux box (Centos 5.3) and I am wondering if I need to accept input and output packets on port 43 even when I don't have a DNS server on the box?<br />
<br />
Thanks
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Hi,

I am configuring iptables on my linux box (Centos 5.3) and I am wondering if I need to accept input and output packets on port 43 even when I don't have a DNS server on the box?

Thanks

Do I need to keep port 43 open even if I don't run a DNS server?

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

Networking Protocols

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.