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  • wildcard a quick way to alter the configurations in Junos

    Suppose, you have multiple following circuits that need to be removed from the configurations, and then have them disabled and marked as an [AVAILABLE]:et-1/0/0 to et-1/0/10et-1/0/13et-1/0/21With traditional approach the configlet would be pretty lengthy, however with wildcard command it's pretty damn ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on November 9, 2014
  • very cool Internet visualization application

    Very, very cool Internet visualization application for Android and Iphones, they are using data from the folks at CAIDA. http://money.cnn.com/2013/03/06/technology/innovation/map-of-the-internet/  
    Posted to Masood Ahmad Shah (Weblog) by jahil on March 7, 2013
  • Juniper pathfinder

    When buying or upgrading a Juniper device, there are always questions that come to mind (Is “this” feature supported on “that” platform, and if so “which” version did it come out?)As of July 1st, Juniper have released the Pathfinder tool: http://pathfinder.juniper.netThis tool is comprised of two features - Feature Explorer and Content ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on July 13, 2012
  • JNCIP-SP Certification Cleared

    Earned my JNCIP-SP certification on May 20, 2011 (A completely new certification by Juniper Networks ).    I hope to finish JNCIE-SP within next 3-4 week. Wish me all the luck :)
    Posted to Masood Ahmad Shah (Weblog) by jahil on May 22, 2011

    <meta charset="utf-8">Earned my JNCIP-SP certification today 
    Posted to jahil (Gallery) by jahil on May 22, 2011
  • How to calculate CAR rate-limit

    Here's just a quick and handy tip for anyone who is after how to calculate CAR rate-limit. normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds extended burst = 2 * normal burst 
    Posted to Masood Ahmad Shah (Weblog) by jahil on February 7, 2011
  • Its Official...No more IPv4 left

    At ICANN IPv6 News Conference, they officially announced, no more IPv4 left.  http://youtu.be/gveJs6YRYXU 
    Posted to Masood Ahmad Shah (Weblog) by jahil on February 4, 2011
  • disable interface TX laser (JUNOS)

    Just in case if you want to simulate a fiber cut, you can enter a command from the FPC shell that cuts the power to the laser of an interfacestart shell pfe network fpcXtest xfp <index> laser offYou can find the XFP index by doing ''show xfp list'' from the shell prompt.  I haven't seen a method that works for SFP interfaces.For sonet ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on December 31, 2010
  • VLANs Cisco/Juniper

    If you are familiar with Cisco switches, and using Cisco switches fairly well, this post will help you to boost your confidence as a Juniper network engineer.  If you can configure a Cisco switch, then you also can configure a JUNOS based switch :)  here you go..   IOS#vlan-database(vlan)#vlan 5 name Internet(vlan)#vlan 6 ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on October 9, 2010
  • Firewall Filter on Juniper's EX-series Switches

    A firewall filters provide rules that define whether to permit or deny packets that are transiting an interface on a switch or router from a source address to a destination address. They can be applied to ports, VLANs, or layer 3 interfaces.  The following firewall filter types are supported for EX-series switches:Port (Layer 2) firewall ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on July 18, 2010
  • MTR on Juniper JUNOS

    You may have used traceroute in a Micrsoft OS or in Unix.  It’s quite simple and can tell you a few things about the connection between you and any other device on the internet. So what if the problem were intermittent, or traceroute did not show any problems because perhaps the choke point is experiencing intermittent bursts of data?  ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on November 8, 2009
  • Viewing default/hidden config on JUNOS

    Would you like to see JUNOS defaults configuration. To view certain JUNOS default settings for dynamic profiles/system/services/applications, you must type the full command: jahil@voyager# show configuration groups junos-defaults Note: TAB/SPACE autocomplete does not work here :)
    Posted to Masood Ahmad Shah (Weblog) by jahil on October 24, 2009
  • Cisco IOS 15.0 (new features).. Awesome

    Cisco released IOS 15.0. This is the next major release after 12.4. It’s been over 4 years since Cisco has delivered a major release of IOS code. The new features listed in the documentation include:  •BGP Event Based VPN Import;•BGP Per Neighbor Graceful Restart Configuration;•BGP RT Changes Without PE-CE Neighbor Impact;•BGP local ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on October 6, 2009
  • JUNOS Command Completion

    The JUNOS command completion feature saves you lots of time and energy, and it provides syntax checking as you type. Gone are the days when you type a command on a line and after you press Enter the command is either invalid or not supported on that version of software. Any error or ambiguity will be detected early, and the router/switch will ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on August 26, 2009
  • Juniper's JUNOS Emacs style cursor movement/Page manipulation

    Remember Juniper's JUNOS is heavily influenced by Unix, afterall it does sit on top of FreeBSD. You can use EMACS commands for cursor movement, which include: Ctrl-a  Moves the cursor to the beginning of the command line, back to the promptCtrl-e Moves the cursor to the end of the command lineCtrl-b Moves the cursor back one characterCtrl-k ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on July 31, 2009
  • JUNOS Aggregated Ethernet Interfaces

    Aggregated ethernet interface increases bandwidth, provides graceful degradation as failure occurs, and of course increases availability. To configure an aggregated ethernet interface on Juniper's boxes, you can use the link aggregation feature to aggregate one or more links to form a virtual link.The client will treat this virtual link as if it ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on July 30, 2009
  • Randy Bush on IPv6 Deployment

    Great interview with Randy Bush. Very interesting thoughts about costs experienced when hitting the IPv4 wall v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false EN-US X-NONE ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on June 13, 2009
  • Configuring the Juniper Media, IP & MPLS MTU

    Here I have some information on MTU Juniper, I had investigated it for a customer while ago. The actual frames transmitted also contain cyclic redundancy check (CRC) bits, which are not part of the media MTU. For example, the media MTU for a Gigabit Ethernet interface is specified as 1500 bytes, but the largest possible frame ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on May 5, 2009
  • JUNOS annotate

    Adding comments to configuration is always tricky with network devices. Annotate is just one of many cool features in JUNOS. The JUNOS CLI lets you leave comments about the configuration as a part of its listing. The comments can be quite handy when you or other team members are trying to troubleshoot a problem or need to make configuration ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on April 2, 2009
  • Scripting for Switches/Routers

    The advantage of having a scripting language on your router seems to come in pretty handy sometimes (though I bet most people don’t really use the Tcl interpreter on their Cisco’s). I have been using TCL scripts for ages. The new EEM is just heavenly, you can trigger on almost everything. Even add your own syslog messages or create menus for ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on March 23, 2009
  • MPLS-in-GRE & MPLS-in-IP

    JUNOS now support MPLS-in-GRE & MPLS-in-IP. You guys can now encapsulate the MPLS label stack for a packet with an IP header, making it possible to tunnel MPLS over networks that do not have MPLS enabled on their core routers. The JUNOS software supports both types of IP-based encapsulations: MPLS-in-IP and MPLS-in-GRE. JUNOS can both push the ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on March 7, 2009
  • Trusted Prefixes (JUNOS vs IOS)

    Juniper's JUNOS: filter trusted-prefixes {   term controlled-access {     from {        address {                     ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on February 9, 2009
  • Exploiting Network Protocols to Exhaust Bandwidth Links

    In Feb 2008 I spoke at a conference about ''Exploiting Network Protocols to Exhaust Bandwidth Links'' in Lahore. ''Chase 2008-Conference On Hacking And Security'' Venue Institute of Engineers PakistanIEP Building2nd Floor, Engineering Centre97-B/D-1, Liberty Round AboutLiberty MarketGulberg II, ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on February 7, 2009
  • JUNOS VPLS on FE Interfaces

    TThere are numerous misconception about VPLS support on Juniper Fast Ethernet PICs. Here is a little quick workaround running VPLS on Juniper's ''PE-4FE-TX and PB-4FE-TX'' PICs. This setup requires MPLS LSPs between PEs...     Interface Configuration: jahil@jahil-re0> show configuration interfaces fe-0/0/2  ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on February 4, 2009
  • A small love story about Routerboard

    RouterBoard makes a complete line of devices that pound-for-pound beat Cisco/Juniper/Nortel/Extreme on features at a much lower price-point. I've been using Cisco/Juniper/Nortel devices for years now and after some seriously productivity killing bugs in their IOS / firewall OS, I would suggest to small companies, that replacing your VPN node ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on January 29, 2009
  • IGP competition ISIS or OSPF

    I understand that this question is a lot more complex than a simple yes or no since factors like design and routing policy will certainly affect the protocols behavior. It's really difficult to decide and get information on what the top network service providers are using for their IGP? I'm trying to build a case for switching from OSPF to IS-IS ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on January 22, 2009
  • JUNOS BGP 'apply-path'

    JUNOS provide very flexible filtering options and support a rich variety of sources besides the usual AS Path, neighbor IP, Port and Prefix-list. Today we will talk about BGP. What do you know about BGP securing BGP session? Instead you can simple block access to the configured BGP neighbors you can use JUNOS apply-path command. Since BGP ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on January 18, 2009
  • 2009 :)

    Posted to jahil (Gallery) by jahil on January 16, 2009
  • BGP default route advertisement

    In most design scenarios, you’d like to advertise the BGP default route to EBGP neighbors without having a BGP default route in your own BGP table. For example, an ISP might decide to advertise only the BGP default route and local BGP networks to customers multi-homed to a single ISP. To advertise a BGP default route to a BGP neighbor, use the ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on January 16, 2009
  • Juniper JUNOS Funny Poetry

    JUNOS guys promise they would not make it boring! If you don't want to configure something on JUNOS, spend some time with JUNOS haiku. A hidden command is a command that does not show up when you use ? in the CLI and does not autocomplete with tab or space bar. One of the most intersting hidden commands in JUNOS software is show version and ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on January 8, 2009
  • IPv6 default routing (Cisco IOS && Juniper JUNOS)

    If your next hop has the information about how to get to everywhere you need to be able to reach,it is easier to use a default route than to list all the locations exhaustively :). Lets get cracking on IPv6 default routing today !    We will use the above simple network toplogy to configure default routing on Cisco/Juniper ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on January 5, 2009
  • Rate limit OR traffic shaping

    Rate limit or shaping is always confusing; as to which one to use.The goal of traffic shaping is hard-limiting of sending rate, while the purpose of rate-limiting is usually admission control based on burst sizes. Traffic shaping hard-forces “fixed” sending rate, absorbing and smoothing incoming packet bursts. Rate-limit never smoothes but ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on January 1, 2009
  • Multi-vendor OSPF implementation on Juniper && Cisco (Part 2)

    Some differences: Because OSPF has several checks and balances in regards to neighbor adjacencies, and because those adjacencies are essential for actual routing, their defaults remain the same between the two vendors. These include authentication (except in the case of OSPFv3), hello/dead intervals and area types. One note about authentication: ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on December 30, 2008
  • Multi-vendor OSPF implementation on Juniper && Cisco (Part 1)

     RFC stuff is really fun; I will take a look at the implementation of OSPF from the perspective of two well known vendors: Cisco and Juniper. Do you know the standards?OSPF version 2 is defined in RFC 2328. Like all protocol standards it details every aspect of the protocol. And like all protocol standards it leaves just enough room for ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on December 30, 2008
  • Juniper Switches

    If you have got a big block of free time, the best way to put that to use is to play with Cisco/Juniper; and thats the reason why i'm not getting married :) Anyways Juniper introduced EX switches, as promised long time before... Here are my findings..EX Switches have Frontal LCD panel for maintenance procedures, isn't it crazy that you can reset ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on December 26, 2008
  • Fastest web browser by a young Karachiite

    A 19 years old Karachiite has developed the fastest web browser named Xtravo which is based on Internet explorer and requires .NET 2.0 framework. It might not sound exciting to Firefox users like me but then It's developed by my country fellow hence I feel proud of it. Users of softpedia and CNet's download rate it quite good and and it's being ...
    Posted to Adnan Siddiqi (Weblog) by kadnan on December 15, 2008
  • Using DNS Name in Cisco Access-lists

    When you configure an access list that should prevent spammers from misusing your network, You obviously had to figure out the IP address of the ISP’s SMTP server (access lists and object groups accept IP addresses). You can enter a hostname in an IOS ACL … and it works. Actually, IOS performs a DNS lookup when you enter the hostname (assuming you ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on November 27, 2008
  • How NBAR actually classifies the traffic flows?

     I still love Cisco. My one true love. It hurts with you :) Anyways lets start with Layer 7 traffic filtring on Cisco router. NBAR protocol classification feature has long supported enhanced HTTP URL matching features. However, Cisco documentation site never provided a detailed description of the pattern language used for URL matching; ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on November 15, 2008
  • Odour ID

    Remember that TV commercial about some talcum powder or perfume?(Correct me If I am wrong): Aray Saba Agayi! Tumhey Kaisa pata chala? Khushboo Batarahee hey   Now scientists can implement Odour ID as an authentication system which is being said is better than Finger print authentication. Now Imagine such computer system is ...
    Posted to Adnan Siddiqi (Weblog) by kadnan on November 12, 2008
  • Chase-2008.jpg

    Security, Hacking   http://www.chase.org.pk/  
    Posted to jahil (Gallery) by jahil on September 18, 2008
  • JNCIS.jpg

    Posted to jahil (Gallery) by jahil on September 18, 2008
  • L2VPN Taxonomy

    Posted to Masood Ahmad Shah (Weblog) by jahil on September 17, 2008
  • L2VPN Taxonomy

    L2VPN Taxonomy
    Posted to jahil (Gallery) by jahil on September 17, 2008
  • JUNOS Candidate Configuration and Explicit Commits

    One of my longtime gripes about IOS is that when you type a new statement to the CLI and hit return, the statement immediately becomes active on the router. For someone as mistake-prone as me, this is a big risk. And given that the majority of network problems are due to human error rather than hardware and software failures, it is a risk for ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on September 14, 2008
  • Scripting and Customization in JUNOS

    JUNOS software (Juniper's) is a highly useful nework operating system for any network engineer to achieve goals. In JUNOS, there are times when you can enter all the individual lines of a configuration correctly, and the configuration can still be wrong.  That is, the combination of commands do not work correctly together or there's something ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on September 8, 2008
  • Recover BGP password (Juniper JUNOS)

    # Get a root shell: jahil@junos> start shell % su - root Password: jahil@jahil% # View the contents of /var/etc/keyadmin.conf jahil@jahil% less /var/etc/keyadmin.conf tcp 179 md5 instance default 0x6162636431323334 tcp 179 :: 2001:DB8:1::1 md5 instance default 0x313233717765727479 # Run the following command ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on August 27, 2008
  • The beauty of Juniper JUNOS

    I'm actually a Cisco/Unix geek. But I'm working on some giant Juniper routers now a days. The beauty of Juniper router opearting system (JUNOS) is, indeed, based on FreeBSD. Upgrading opearting system is my favorite things, because I love impressive new features. I come from a unix background where such a thing is easily allowed. I'm gonna write a ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on August 1, 2008
  • Create a direct shortcut to Network Connections (Windows Vista)

    The new Network and Sharing Center in Windows Vista is great for the average Windows user but can be a huge headache for advanced users. When I need to make a change to my network settings I don't want to be forced to go through the networking interface for the average non-technical users.  I want to go right to the settings screen and make ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on July 28, 2008
  • JNCIS-M Certification Cleared

    so finally cleared Juniper’s JNCIS-M exam today. I hope to finish JNCIP-M within next 3-4 week. Wish me all the luck :)
    Posted to Masood Ahmad Shah (Weblog) by jahil on July 21, 2008
  • Juniper Router On The Stick Configuration (JUNOS)

    Router JAHIL is directly connected to a VLAN-capable switch and needs to be configured to talk to AHMIQ on one subnet and NAKAMA on another over the same Fast Ethernet port. The first step in configuring VLANs is to enable VLAN tagging on the physical interface, as shown below: [edit interfaces fe-0/0/1] lab@JAHIL# set vlan-tagging [edit ...
    Posted to Masood Ahmad Shah (Weblog) by jahil on June 26, 2008
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