Hosts from LAN1 should be able to access hosts at LAN2 and vice-versa through GRE tunnel between R1 and R2. ISP doesn’t care what networks are behind R1 and R2 so the only way to establish connection between LAN1 and LAN2 is to use VPN, in this example we use GRE.
GRE setup example topology
Below is the link list to essential Cisco related cheat sheets (collection of notes or quick reference guides whatever). By the way, we don’t recommend to cheat anything and/or do a cheating of any sort by means of using these materials 
1. Cisco IOS Versions what’s this?)
2. Physical Terminations/Connectors (what’s this?)
3. VLANs (what’s this?)
4. Quality of Service (what’s this?)
5. MPLS (what’s this?)
6. IP Access Lists what’s this?)
7. Spanning Tree (what’s this?)
8. OSPF (what’s this?)
9. EIGRP (what’s this?)
10. BGP (what’s this?)
11. General Cisco IOS cheat sheet (router/switch commands etc.)
12. Cisco Commands for Beginners
13. Descriptive list of Cisco Commands (fresh)
14. Cisco IOS Firewall Cheat Sheet (Official Design Guide)
15. Cisco – Ethernet Encapsulation (in pdf)
16. Mini CCNA Cheat Sheet
17. CCNA Cheat Sheet (commands debugging)
18. Connector Pinouts Cheat Sheets
Great thanks to Jeremy Stretch (author of packetlife.net) for the first 10 cheat sheets from above list (to get them all just download this package).
ipcad is IP accounting daemon with Cisco-like ip accounting export. It runs in background, listens traffic on the specified interfaces, and records the traffic for later retrieval and analysis.
Here is a piece of shell code that allows to export ipcad output into sqlite3 database format:
echo "create table traffic (src, dst, pkt, bt);" | sqlite3 /tmp/throttle.db
rsh 127.0.0.1 show ip accounting | grep "^ " | grep -vi source | awk \
'{print"insert into traffic values (\""$1"\",\""$2"\",\""$3"\",\""$4"\");"}' \
| sqlite3 /tmp/throttle.db
To make this working ipcad should be configured not to capture ports and to enable rsh service. In my case ipcad has the following settings set in ipcad.conf:
capture-ports disable;
interface eth0;
rsh enable at 127.0.0.1;
rsh 127.0.0.1 admin;
rsh ttl = 3;
rsh timeout = 30;
pidfile = /var/run/ipcad.pid;
memory_limit = 100m;
and output (rsh 127.0.0.1 show ip accouting) is like:
192.168.0.7 192.168.0.1 113241 166387462 192.168.0.1 192.168.0.7 72117 4282846 192.168.0.77 66.235.184.245 2448 821095 66.235.184.245 192.168.0.77 3995 697371
The main problem is that it sqlite3 is rather slow and it takes eleven (11!!!) seconds to export 1000 entries of ipcad’s output into database. This was got at PC with 1.4Ghz CPU and 512Mb RAM.
If anybody knows how to get it faster, PLEASE LET ME KNOW! Thanks.
Information Improvisation: Traffic Engineering Server is new Solution for Bandwidth Management and QoS. It’s especially suitable for Broadband ISPs and SMEs.
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My name is Artem Nosulchik (artiomix AT gmail DOT com) and I'm Linux/Unix, Cisco systems engineer. The main idea of Linux Screw is to share relevant knowledge, skills and observations over The Web. Here you can find a lot of information related to different Linux distributions, FreeBSD, IOS as well as a other Open Source around staff. Read more ›› |
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