Added tips for LinuxBIOS, usenet, ipv6, NFS and shadow passwords as requested by...

[grml-tips.git] / grml_tips

diff --git a/grml_tips b/grml_tips
index ce98176..d53fa20 100644 (file)
--- a/grml_tips
+++ b/grml_tips
@@ -2630,6 +2630,144 @@ any further work.
 -- 
 Debugging SSL communications:
 
-% openssl s_client -connect webmail.grml.org:993
+% openssl s_client -connect server.adress:993
+
+or
 
 # ssldump -a -A -H -i eth0
+
+See http://prefetch.net/articles/debuggingssl.html for more details.
+-- 
+Remove bootmanager from MBR:
+
+# lilo -M /dev/hda -s /dev/null
+-- 
+Rewrite grub to MBR:
+
+# mount /mnt/sda1
+# grub-install --recheck --no-floppy --root-directory=/mnt/sda1 /dev/sda
+-- 
+Rewrite lilo to MBR:
+
+# mount /mnt/hda1
+# lilo -r /mnt/hda1
+-- 
+Create screenshot of plain/real console - tty1:
+
+# fbgrab -c 1 screeni.png
+-- 
+Create screenshot when running X:
+
+% scrot
+
+Tip: use the gkrellshoot plugin when using gkrellm
+-- 
+Redirect all connections to hostA:portA to hostB:portB, where hostA and hostB are
+different networks:
+
+Run the following commands on hostA:
+
+echo 1 > /proc/sys/net/ipv4/ip_forward
+iptables -t nat -A PREROUTING -p tcp --dport portA -j DNAT --to hostB:portB
+iptables -A FORWARD -i eth0 -o eth0 -d hostB -p tcp --dport portB -j ACCEPT
+iptables -A FORWARD -i eth0 -o eth0 -s hostB -p tcp --sport portB -j ACCEPT
+iptables -t nat -A POSTROUTING -p tcp -d hostB --dport portB -j SNAT --to-source hostA
+-- 
+Flash BIOS without DOS/Windows:
+
+Dump flash info and set the flash chip to writable:
+# flashrom
+
+Backup the original BIOS:
+# flashrom -r backup.bin
+
+Notice: the following step will overwrite your current BIOS!
+So make sure you really know what you are doing.
+
+Flash the BIOS image:
+# flashrom -wv newbios.bin
+
+Also check out LinuxBIOS: http://linuxbios.org/
+-- 
+Enable shadow passwords:
+
+# shadowconfig on
+-- 
+Set up an IPv6 tunneln on grml:
+
+# ipv6-tunnel start
+-- 
+Set up console newsreader slrn for use with Usenet:
+
+% grml-slrn
+-- 
+Calculate with IPv6 addresses:
+
+% ipv6calc
+
+For usage examples refer to manpage ipv6calc(8).
+-- 
+Common network debugging tools for use with IPv6:
+
+% ping6
+% tracepath6
+% traceroute6
+% tracert6
+% nc6
+% tcpspray6
+-- 
+Set up NFS (Network File System):
+
+Server-side
+~~~~~~~~~~~
+Make sure the relevant services are running on the server side:
+
+# /etc/init.d/portmap start
+# /etc/init.d/nfs-common start
+# /etc/init.d/nfs-kernel-server start
+
+Export shares via /etc/exports:
+
+/backups 192.168.1.100/24(rw,wdelay,no_root_squash,async,subtree_check)
+
+... or manually export a directory running:
+
+# exportfs -o rw,wdelay,no_root_squash,async,subtree_check 192.168.1.100:/backups
+
+and unexport a share running:
+
+# exportfs -u 192.168.1.100:/backups
+
+and every time when you modify /etc/exports file run
+
+# exportfs -ra
+
+Display what NFS components are running:
+
+# rpcinfo -p
+
+Display list of exported shares:
+
+# exportfs -v
+or
+# showmount -e
+
+Client-side
+~~~~~~~~~~~
+Make sure the relevant services are running on the client side:
+
+# /etc/init.d/portmap start
+# /etc/init.d/nfs-common start
+
+Verify that the server allows you to access its RPC/NFS services:
+
+# rpcinfo -p server_name
+
+Check what directories the server exports:
+
+# showmount -e server_name
+
+On the client side you can use something like the following in /etc/fstab:
+
+192.168.1.101:/backups /mnt/nfs nfs defaults,users,wsize=8192,rsize=8192 0 0
+--