Problems in PC/Linux

1. Refresh NIS password to clients after adding user on server
   Solution:
   cd /var/yp
   make
   ps ax|grep ypserv <----- Find out the PID of current ypserv
   kill -9 PID of ypserv
   /usr/sbin/ypserv
   
   
2. Install suidperl....... (bad idea, but needed sometimes)
   Untar from scratch.
   sh Configure -Dd_dosuid
   make ; make test ; make install
   
   
3. Dell PowerConnect 5224 Switch causes DHCP or PXE-BOOT timeout
   (Also applies to SMC 8848M)
   Solution:
   Log into the switch from Web interface;
   Enable (checkbox) the "Fast Link" of each port in the menu of
   System -> Spanning Tree -> Port Setting -> Fast Link ;
   Fast Link immediately enables the port in forwarding state when a link comes up.
   The port is not part of the Spanning Tree at that time, but will participate
   in future Spanning Tree resolutions.

   

   Remember to save the setting to the startup file otherwise this change will vanish after the switch reboots.
   Sketched from http://bbcr.uwaterloo.ca/~brecht/servers/docs/Dell-5224/pc5224cd.htm#1099395
   
   In SMC 8848M it is called "Fast Forward", located under the menu of
   Spanning Tree -> STA -> Port Configuration, named as Admin Edge Port (Fast Forwarding).
   Setting can also be done by CLI instead of web interface. Commands follow:
   

   config
   interface eth 1/1-48
   spanning-tree edge-port
   end
   

   Then save the setting as boot default by:

   copy run sta
   

   and give a filename to save. (Boot file can be verified by the command dir ).
   In addition, 802.3x flow control in SMC 8848M is enabled by:

   config
   interface eth 1/1-48
   cap flow              (or in canonical form: capabilities flowcontrol)
   end
   

   
   
4. The ssh returns
   

   Warning: no access to tty (Bad file descriptor).
                                                   Thus no job control in this shel
   l.

   and hangs the terminal while attempting to connect to a host. But actually that machine is still alive and console works fine.
   Solution:
   Do the following from a remote machine:
   ssh root@that_host "mkdir /dev/pts;mount /dev/pts"
   See also https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=128154
   Configurations that the problem is still observed: FC4 for AMD64 with vallina kernel 2.6.14 on EM64T. (20051108)
   
5. Problem installing r1000 NIC driver from Realtek
   Solution:
   Refer to the following link to resolve compilation errors.
6. Ubuntu kernel version mapping list:
   https://people.canonical.com/~kernel/info/kernel-version-map.html