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I'm a Cisco CCNP who has moved from an ISP to a smaller company whit no Cisco equipments: using Linux boxes instead for routing and firewalling purposes.

Beside the fairly common configs of ip addressing, netmask and static routing, there are also some more complicated stuff like policy routing (a concept that I learned in the Cisco universe called PBR, Policy Based Routing).

I've tried to search for some good information about Linux networking but it seems that most of the stuff are a bit old'ish (before 2010):

Guide to IP Layer Network Administration with Linux (1)

Linux Advanced Routing & Traffic Control HOWTO (2)

In your opinion, are these still valid and enough updated or are there best study and learning material?

Thanks in advance!

closed as primarily opinion-based by John, Stephen Harris, Jeff Schaller, Networker, slm Aug 30 '16 at 12:51

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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From both the links you provided , mostly talks of tools that be used in Linux Box for networking purpose . Most of the tools like

  iptables -  Linux firewall 
  tcpdump  - Packet Capturing tool
  arp  -> Managing ARP cache
  route -> Managing routes in a Linux host  
  mtr  --> network diagnostic tool 
  traceroute  --> Checking Packet route 
  netstat  --> Display network information
  tc --> manipulate traffic control settings

are still valid as of RHEL 6.

zebra which turns a Linux box into a software based router is now Quagga and is still being maintained . There last release was in march , 16 .

http://download.savannah.gnu.org/releases/quagga/

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