4 articles tagged "dns queries"

Security Alert: FreeBSD-SA-08:06.bind DNS cache Poisoning
The BIND DNS implementation does not randomize the UDP source port when doing remote queries, and the query id alone does not provide adequate randomization.
How do I build a Simple Linux Firewall for DSL/Dial-up connection?
If you’re new to Linux, here’s a simple firewall that can be setup in minutes. Especially those coming from a Windows background, often lost themselves while creating linux firewall.
This is the most common question asked by Linux newbies (noobs). How do I install a personal firewall on a standalone Desktop Linux computer. In other words [...]
Linux Iptables block or open DNS / bind service port 53
The domain name service provided by BIND (named) software. It uses both UDP and TCP protocol and listen on port 53. DNS queries less than 512 bytes are transferred using UDP protocol and large queries are handled by TCP protocol such as zone transfer.
i) named/bind server – TCP/UDP port 53
ii)Client (browser, dig etc) [...]
How to: Troubleshoot UNIX / Linux BIND DNS server problems
BIND is the Berkeley Internet Name Domain, DNS server. It is wildly used on UNIX and Linux like oses. You can use following tools to troubleshoot bind related problems under UNIX or Linux oses.
Task: Port 53 open and listing requests
By default BIND listen DNS queries on port 53. So make sure port 53 is open [...]

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