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Posts Tagged with "iptables"

  • Data and Technology

    Posted on December 31st, 2008

    Written by cliff

    Tags

    apache, centos, firewall, iptables, lamp, linux, mysl, port forward, security, ssh

    Basic iptables Configuration

    Basic iptables Configuration

    It’s always a good idea to setup a local firewall on hosts that are on unprotected networks. The internet “winds” blow harder and harder each day, and it’s only a matter of time before some daemon has an exploit that gets taken advantage of. I use CentOS 5 for all my web servers, and here [...]

  • Data and Technology

    Posted on April 9th, 2008

    Written by cliff

    Tags

    esx. esx server, firewall esxcfg-firewall, iptables, nptdate, ntp, ntpClient, ntpd, outbound UDP, port 123, time, time servr, udp, vmware

    VMware ESX 3.5 ntpdate strangeness

    VMware ESX 3.5 ntpdate strangeness

    We just noticed that the time was very far off on our sparkly new VMware EXS 3.5 server. When I went to run ntpdate to bring it up to sync, I was suprised to find that it could not make a connection to the time server because outbound UDP 123 traffic was blocked by the [...]

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