From: Michael Prokop Date: Wed, 11 Jul 2007 22:12:21 +0000 (+0200) Subject: Added some further tips (SSL debugging, lilo/grub, screenshot..) X-Git-Tag: 0.4.2 X-Git-Url: http://git.grml.org/?p=grml-tips.git;a=commitdiff_plain;h=260058bf14a528851d5ef3b5fd731767d0f37adc Added some further tips (SSL debugging, lilo/grub, screenshot..) --- diff --git a/debian/changelog b/debian/changelog index ab955d3..276ca7f 100644 --- a/debian/changelog +++ b/debian/changelog @@ -1,8 +1,8 @@ grml-tips (0.4.2) unstable; urgency=low - * Added some further tips (SSL debugging). + * Added some further tips (SSL debugging, lilo/grub, screenshot,...). - -- Michael Prokop Sat, 16 Jun 2007 22:39:54 +0200 + -- Michael Prokop Thu, 12 Jul 2007 00:12:04 +0200 grml-tips (0.4.1) unstable; urgency=low diff --git a/grml_tips b/grml_tips index ce98176..1fe0515 100644 --- a/grml_tips +++ b/grml_tips @@ -2630,6 +2630,46 @@ 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 +-- +