Preparing for Cisco certification exam and need real equipment required to accomplish all those CCNA or CCNP labs? That’s not a problem any more. This is due to availability of Packet Tracer for Linux and Community Lab hosted by people behind packetlife.net. As for Packet Tracer it supports Linux natively now — Cisco offers it as deb package for Ubuntu or Debian and there is no need to use Wine [...]
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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
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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).
Information improvisation: You can get your 000-152 and 70-293 exam within days using latest 642-974 and other resources of 1z0-515 exam certifications; you can get a wonderful JN0-343 booklet.
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 [...]
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