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Linux

linux Linux (centos / debian) notes

Softer Ether VPN Notes

To diable vpnserver from calling home, i.e. stop all the chit-chat for nat traversal and just use it as a normal vpnserver.

Step 1 dissable DDNS change the config file DDNS section to read:

declare DDnsClient { bool Disabled true }

Step 2 dissable UDP acceleration I did this from the config file by setting:

bool DisableUdpAcceleration true

Step 3, Disable Nat Traversal In the config file change the following setting.

bool DisableNatTraversal true

Step 4, turn off keep alive. This is via the GUI on the server encryption and network button.

Step 5, turn of auto update check. Again this is via the GUI on the server encryption and network button.

Having done the above (thanks to dnobori, for the ones I missed) and restarted the server, I know don't see any outbound / unexpected traffic.

Virtualization

virt All sorts on virtualization, Xen etc

Mac OSX

mac Mac related notes

Vodaphone useful numbers

vodafone Vodafone numbers

Apps and software

• software Applications notes (mostly web based apps, notes on configuring building apache,php,openssl etc)
• unreal Unreal tournament
• bitsBits and pieces
• asterisk Asterisk notes
• mwiki MediaWiki bits and bobs
• dovecot Things about dovecot and postfix
• Docmgr Installation notes

DNS

DNS related Notes on dns, mostly out of date

Mac DNS Mac DNS flush cache

Windows

to enable telnet

    Start
    Control Panel
    Programs And Features
    Turn Windows features on or off
    Check Telnet Client

Certificates

Check key / cert are mached (also csr )

checking the modulus and the public exponent portions in the key and the Certificate must match.

But since the public exponent is usually 65537 and it's bothering comparing long modulus you can use the following approach:

$ openssl x509 -noout -modulus -in server.crt | openssl md5
$ openssl rsa -noout -modulus -in server.key | openssl md5

And then compare these really shorter numbers.

if I want to check to which key or certificate a particular CSR belongs you can compute

$ openssl req -noout -modulus -in server.csr | openssl md5

Electronics Related

Microphone pre-amp for apple mac

This simple circuit was built on vero board in a matter of 40 mins. Not pretty but it was made of mostly second hand bits, infact two of the resistors bellow where from a PC board from a 1980's computer!