DIG useful commands

Sunday, December 14th, 2008

Traces starting from root nameservers. Useful for getting the current nameservers set on a domain; dig connexeon.com +trace ; <<>> DiG 9.3.3rc2 <<>> @85.158.106.50 connexeon.be +trace ; (1 server found) ;; global options: printcmd . ...

Posted in Linux, Networking | No Comments »

Open Source Support with public mirrors

Friday, December 12th, 2008

Connexeon provides services based on some open source software solutions. We want to support the open source community with free public mirrors. Following public mirrors are currently available on our network: Centos (full mirror): http://centos.mirror.connexeon.net Putty: http://putty.mirror.connexeon.net Following services are also available on our network: Plesk update mirror (CentOS latest 8 and 9 versions ...

Posted in Linux, Networking, Plesk | No Comments »

Windows iSCSI dynamic disk does not reconnect after reboot

Thursday, October 16th, 2008

It's not possible; Dynamic disks (applies to Windows 2000 and Windows Server 2003): Configuring volumes on iSCSI disks as Dynamic disk volumes using the Microsoft software iSCSI initiator is not currently supported. It has been observed that timing issues may prevent dynamic disk volumes on iSCSI disks from being reactivated ...

Posted in Networking, Storage, Windows | No Comments »

Windows firewall

Monday, September 15th, 2008

There are different ways to configure firewalling on Windows servers: - Build in Windows Firewall - TCP/IP filtering - Routing and remote access. If you are using the windows Firewall you can easy manage the Firewall settings via Conrtrol Panel > Windows Firewall or via the properties of your network. You can also configure the ...

Posted in Networking, Windows | No Comments »

UUNet caching nameservers

Wednesday, June 4th, 2008

Useful to use as recursor/forwarders: cache00.ns.uu.net [198.6.1.1] cache01.ns.uu.net [198.6.1.2] cache02.ns.uu.net [198.6.1.3] cache03.ns.uu.net [198.6.1.4] cache04.ns.uu.net [198.6.1.5] cache05.ns.uu.net [198.6.1.195] cache06.ns.uu.net [198.6.1.122] cache07.ns.uu.net [198.6.1.142] cache08.ns.uu.net [198.6.1.146] You could use this for /etc/resolv.conf nameserver 198.6.1.1 nameserver 198.6.1.2 nameserver 198.6.1.3 nameserver 198.6.1.4 nameserver 198.6.1.5 nameserver 198.6.1.195 nameserver 198.6.1.122 nameserver 198.6.1.142 nameserver 198.6.1.146

Posted in Networking | No Comments »

Test network performance with nuttcp

Monday, May 26th, 2008

Installation wget http://www.lcp.nrl.navy.mil/nuttcp/stable/rpm/nuttcp-5.3.1-1.i386.rpmrpm -i nuttcp-5.3.1-1.i386.rpm Run as server on target machine nuttcp -S Make sure tcp ports 5000 and 5001 are opened. Test target Basic without bandwidth limitation; nuttcp -i1 hostname With 40Mpbs bandwidth limitation; nuttcp -i1 -Ri40m hostname Output results like this; 4.8125 MB / ...

Posted in Linux, Networking, Windows | No Comments »

Setting up a server for Linux and Windows PXE network booting on CentOS / RHEL

Friday, March 7th, 2008

Intro PXE itself stands for "Pre-boot eXecution Environment", which describes how it works in the sense that the clients using it haven't booted in a traditional manner. In order to use PXE you need to setup a boot-server which will allow client systems to : Request an IP address (via DHCP) Download a kernel ...

Posted in Linux, Networking | 1 Comment »

Cisco Catalyst 2950 config example with uplink trunk and static access ports

Thursday, January 24th, 2008

This sample config configures your Cisco Catalyst switch with; Port 24: trunk port (for uplink) Ports 1-23: access ports (all VLAN 4 in this example) Storm control on each port Enables SNMP % Please answer 'yes' or 'no'. Would you like to enter the initial configuration dialog? [yes/no]: no enable config hostname blabla.ds.connexeon.net clock timezone CET 1 ip subnet-zeroip ...

Posted in Networking | No Comments »

Configuring static routes in RHEL3+

Sunday, December 16th, 2007

The new way to add static routes on Red Hat Enterprise Linux systems is to create a file /etc/sysconfig/network-scripts/route-ethX where X corresponds to the network interface you wish to use the alternate route(s). This file deals with three fields: GATEWAY, NETMASK, and ADDRESS. Each field should have a number appended ...

Posted in Linux, Networking | No Comments »

Add static routes to incoming VPN connections on PopTop VPN

Tuesday, November 13th, 2007

You may want to add a static route to incoming VPN connections on a PopTop VPN server. This only works when you define a static IP for the incoming VPN client in /etc/ppp/chap-secrets. Create a file called /etc/ppp/ip-up.local and chmod 700 it. I also used a sort of log as you can ...

Posted in Linux, Networking | No Comments »