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 from your math account, but 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

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.

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

.ssh/config

Host styx.math.uni-sb.de
    Port 22123
    User <your username>
    ForwardAgent yes

Please change content inside this brackets: <>

.ssh/config

Host styx 
    HostName styx.math.uni-sb.de
    Port 22123
    User <your username>
    ForwardAgent yes
 
Host gemini
    HostName gemini.math.uni-sb.de
    Port 22
    User <your username>
    ProxyJump styx
 
Host git
    HostName git.math.uni-sb.de
    Port 22
    User <your username>
    ProxyJump styx
 
Host virgo
    HostName virgo.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
 
Host taurus
    HostName taurus.math.uni-sb.de
    Port 22
    User <your username>
    ProxyJump styx

etc.

Change brackets and text in between - like „<xxx>“ - with your data

.ssh/config

Host www
    HostName www.math.uni-sb.de
    Port 22
    User <your groups login name>
    ProxyJump styx

ssh www connects you then directly to the right account.

cd /exports/ag/ag-<your ag-name> 

to reach the public area.

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>

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

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

Intern:

host = <ein Server der Mathematik>

host:~$ ssh host
channel 0: open failed: administratively prohibited: open failed
stdio forwarding failed
ssh_exchange_identification: Connection closed by remote host

• ICMP gesperrt?
• Firewall aktiviert?