====== Jumphost ======
This page provides information for **users** with accounts at the **department of mathematics** at 'Universität des Saarlandes'.
(E.g. you have an email-Address <user name>@math.uni-sb.de)

  * //Name//: **styx.math.uni-sb.de**
    * //Access//: with credentials for your **math account**
    * Hint: keep in mind that your homedir is sepeate here for jumphost ''styx'' and not backed up!
    * //Method// protocol: ssh //Port//: 22123
    * **Inside** Uni des Saarlandes ''styx'' is reachable via //Port:// 22
  * //Name//: **contact.math.uni-sb.de**
    * //Access//: with credentials for your **SIC account** and you are Member of Math Department

Main purpose of a jumphost is to secure access from outside.
So you can have access with ''ssh'' first to contact with a seperate homedir but same login as all hosts in 
the domain ''math.uni-sb.de''.
From ''contact'' you can access all hosts in the given domain.


===== ssh proxy commands =====

in your ''~/.ssh/config'' you can add something from this examples. Please replace ''<your username>'' with your login name at math department:

<file bash .ssh/config>
Host styx.math.uni-sb.de
    Port 22123
    User <your username>
    ForwardAgent yes
</file>


==== For Users and without VPN: ====
__Please change content inside this brackets: <>__
<file text .ssh/config>
Host styx 
    HostName styx.math.uni-sb.de
    Port 22123
    User <your username>
    ForwardAgent yes
    
Host co
    Hostname contact.math.uni-sb.de
    port 22
    user <change to your username at SIC>
    ForwardAgent yes

Host wsco
    Hostname <host in your Dep. w/ Port 22 open>.math.uni-sb.de
    user <your user name on Workst. in your Dep.>
    ProxyCommand ssh co -W %h:%p

# Server
Host gemini
    HostName gemini.math.uni-sb.de
    Port 22
    User <your username>
    ProxyJump styx
    
Host <your favorite host inside>
    HostName <your favorite host inside>.math.uni-sb.de
    Port 22
    User <your username>
    ProxyJump styx
    
Host aries
    HostName aries.math.uni-sb.de
    Port 22
    User <your username>
    ProxyJump styx
    
# Exmple for AG Brandhorst
Host d9-sb
    HostName d9-sb.math.uni-sb.de
    Port 22
    User <your username>
    ProxyJump styx
</file>

//etc.//

==== Access your groups web pages for editing: ====
Change brackets and text in between - like "<xxx>" - with your data
<file config .ssh/config>
Host www
    HostName www.math.uni-sb.de
    Port 22
    User <your groups login name>
    ProxyJump styx
</file>
''ssh www'' connects you then directly to the right account.
  cd /exports/ag/ag-<your ag-name> 
to reach the public area.

==== Connect to Subversion ====

//obsolete SVN is OFF//

   ssh -p 22123 <your username>@<jumphost> -L 3691:svn.math.uni-sb.de:3690

use this svn url:

   svn://localhost:3691/<your username>

==== git ====
Please send your public key to systemverwaltung at math . uni-sb . de

===== sshuttle =====

you can try ''sshuttle'' from within linux
Installation in Debian or Ubuntu

===== Fehlersuche =====
//Intern://

host = <ein Server der Mathematik>.math.uni-sb.de
<code>
host:~$ ssh host
channel 0: open failed: administratively prohibited: open failed
stdio forwarding failed
ssh_exchange_identification: Connection closed by remote host
</code>

  * ICMP gesperrt? 
  * Firewall aktiviert?


===== Neuere Versionen =====
Neue Kommandos in
<file text ~/.ssh/config>
...
ProxyJump
,,,
</file>