Nersc.md

 # NERSC
+
+If you have an ORNL computer and so are on the internal network to ssh to nersc machines you must you a ssh proxy like `corkscrew`
+
+On OSX install homebrew ([explained here](OSX))
+```shell
+brew install corkscrew
+```
+
+On linux
+```shell
+spack install corkscrew
+```
+or just get it from [github](https://github.com/bryanpkc/corkscrew) and compile
+
+Add the following to your `~/.ssh/config`
+```shell
+Host *.nersc.gov
+ProxyCommand corkscrew snowman.ornl.gov 3128 %h %p
+```
+
 ## [NERSC has its own excellent docs](http://www.nersc.gov/users/)
 Things can be a little hard to find though so here are some important points
 ### [Slurm on Nersc](http://www.nersc.gov/users/computational-systems/cori/running-jobs/slurm-at-nersc-overview/)