I recently installed an IPcop 1.4 in vmware to replace my old firewall at home. I also need to filter some unwanted website for my kids.
=== Time/Clock problem ===
Due to the well known time sync problem of all virtual machine, the clock in my Ipcop often running slow. IPcop use fcrontab, so I add the line below to sync to NTP every 1 minute.
#Sync NTP every 1 minute
@ 1 /usr/bin/ntpdate -s pool.ntp.org
=== VPN MTU problem ===
After setting up Ipsec VPN to my office, I found that my Outlook is not able to receive emails (while the VPN is perfectly connected)
After spending hours to search and try. I found the solution is to set the VPN MTU to 1410 (in the VPN screen of IPcop). This is probably because I have a PPPoE connection.
To find out the correct MTU size, use
ping server-at-the-other-end -l 1410
where the parameter -l is to used to test the size of the packet of the the VPN, start from 1500 first, and then reduce it to find out the largest possible packet size.
NX is a quick way to remote administrate my Linux servers (speed comparable to RDP or ARD).
The NoMachine NX Free Edition only allow 2 concurrent sessions (enough for administration purpose). If you need more concurrent sessions, you have to use the paid version or FreeNX server.
- CentOS 5.2 i386
- NoMachine NX Free Edition for Linux 3.2.0-16
- Windows Vista Business SP1
- NoMachine NX Client for Windows 3.2.0-13
Install NX Server
- login as root
- go to www.nomachine.com
- Download the NX Free Edition for Linux i386 Client, Node and Server
- double-click nxclient-3.*.i386.rpm to install the client
- double-click nxnode-3.*.i386.rpm to install the node
- double-click nxserver-3.*.i386.rpm to install the server
- CentOS 5.2 i386
- VMware Server 1.06 (free) version
Install VMware Tools
Install kernel development and compiler first
yum install yum-fastestmirror
yum install kernel-devel gcc gcc-c++
yum upgrade kernel kernel-devel