links for 2008-10-08

• PMTU – Path MTU Discovery
  Internet computers, mostly servers, sometimes send packets too large for part of a given path. Not handling this correctly can make the server unusable for some people.
  (tags: tutorial sysadmin security reference pppoe path networking network mtu)
• Graphical Greeter Themes
  This section describes the creation of themes for the Graphical Greeter. For examples including screenshots, see the standard installed themes and the themes from the theme website.
  (tags: gnome gdm themes reference documentation howto)