Pages from my notebook
Posted in Linux on May 20th, 2015
Trivial to create: ahoward@martlet[~]$ mkfifo pipe1 ahoward@martlet[~]$ ls -l pipe1 prw-r–r– 1 ahoward ahoward 0 May 19 22:16 pipe1 ahoward@martlet[~]$ A bit trickier to use: ahoward@martlet[~]$ echo test > pipe1 (hangs…) ^C ahoward@martlet[~]$ cat pipe1 (also hangs…) Any attempt to read or write from the pipe hangs. The problem here is that a […]
By default, a linux machine will drop traffic that’s not destined for an IP bound locally. If you’re planning on receiving traffic not ultimately destined for you (ie: you’re behaving as a router along the path to the ultimate destination), then you’ll need to flip a couple flags in /etc/sysctl.conf to allow traffic forwarding: net.ipv4.ip_forward […]
If you have a mail server installed it’s pretty easy. Every mail server is going to provide a sendmail binary, so that’s what we’ll use. The bare minimum is as follows: sendmail -t <<EOF To: [email protected] Subject: Test Body . EOF That’s probably not going to reach the destination, however. The problem with this is […]
My last post described in detail the steps to effectively block all network traffic from an attacking IP. Here’s how to block an IP in linux: iptables -A INPUT -s IP-To-Block -j DROP iptables -A INPUT -d IP-To-Block -j DROP Of course, that takes advantage of the built-in linux firewall. We didn’t use the built-in […]
Granted, some of these are probably SSH or Putty hot-keys. I’m not certain there’s going to be a “Bash hot-keys 2” post, but there are probably plenty of combinations I’ve forgotten or have yet to learn, so we’ll call this post part 1, and there will most likely be more. ctrl+l That’s a lowercase L. […]
RootMyPC
Pages from my notebook
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