FAQ for the 'Openbsd' Category

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FreeBSD Find Out Network Card / Port Speed

Q. Under Linux I can use Ethtool and mii-tool, but they are not available under FreeBSD. How do I tell the port speed of the nic under FreeBSD operating system?
BSD FTP-Proxy: PF Firewall Allow Outgoing Active / Passive FTP Connections

Q. I’ve FreeBSD based Apache webserver. I need to allow outgoing ftp client requests so that BSD ports collection can download from various ftp sites. How do I allow outgoing FTP connection via PF network firewall software under FreeBSD or OpenBSD operating system?
How To Setup Vanity DNS Name Server Using BIND 9
I’ve nameserver like ns1.example.com and ns2.example.com. I’d like to provide Vanity DNS for each domain such as ns1.yourdomain.com and ns2.yourdomain.com. Basically, my users should able to call my dns server as their own servers. This will create the illusion that my user run their own name servers. How do I setup vanity DNS using BIND 9 under UNIX / Linux?
Find Out If My DNS Server Free From DNS Cache Poisoning Bug Or Not
How do I verify that my ISP or my own recursive resolvers are free from DNS cache poisoning bug that is promised full disclosure of the flaw by Dan on August 7 at the Black Hat conference? How do I test my dns server for DNS cache pollution or DNS Cache Poisoning bug?
Access Any Remote Server Port Without Modifying Firewall Settings
I’ve couple of remote servers and I’d like to access few admin only application running on port 10000 and 3001. My firewall only allows port 80, 443, 25, 22 and 110 for public access. Do I need to open port 10000 and 3001 for everyone using firewall? How do I access my admin only apps without opening port 10000 and 3001?
FreeBSD / OpenBSD: PF Firewall Filter Large Number Of Subnets and IP Address

Q. How do I filter larger number of subnets and IPs using OpenBSD’s pf firewall under FreeBSD 7.x server? How do I log all dropped packets from such ips? How do I block upto 10000 IPs or subnet without any performance penalty?
How To Hide BIND DNS Sever Version
How do I hide my dns server version number from command such as - “dig @ns1.example.com -c CH -t txt version.bind” under UNIX / Linux oses?
Debian / Ubuntu Linux Public key Blacklisted (see ssh-vulnkey(1)) Error and Solution
How do I fix - “Public key Blacklisted (see ssh-vulnkey(1))” error under any Linux based desktop system?
How To Set Caching DNS Server
How do I set caching dns server to speed up dns lookup for my LAN (500 PC)? The DNS lookups creating a lot of network activity. There are a few times when this causes performance issues. How do I configure caching dns under Debian Linux?
Ubuntu / Debian Linux Regenerate OpenSSH Host Keys
How do I regenerate OpenSSH sshd server host keys stored in /etc/ssh/ssh_host_* files under Debian Linux server? Can I safely regenerate ssh host keys using remote ssh session as my existing ssh connections shouldn’t be interrupted?