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Masood Ahmad Shah

This blog contains a summary of my research readings and thoughts in system and network engineering. View Masood Shah's profile on LinkedIn

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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);} Read More...

Posted Saturday, June 13, 2009 3:31 PM by jahil | 0 Comments

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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 Read More...

Posted Tuesday, May 05, 2009 1:08 PM by jahil | 2 Comments

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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 Read More...

Posted Thursday, April 02, 2009 5:16 PM by jahil | 0 Comments

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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, Read More...

Posted Monday, March 23, 2009 5:57 PM by jahil | 0 Comments

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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 Read More...

Posted Saturday, March 07, 2009 2:22 PM by jahil | 2 Comments

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Trusted Prefixes (JUNOS vs IOS)
Juniper's JUNOS: filter trusted-prefixes { term controlled-access { from { address { 192.168.1.0/24; 128.29.31.0/24; 207.46.150.0/24; 206.132.25.0/24; 208.48.26.0/24; 207.159.55.0/24; 167.216.192.0/24; } protocol tcp; port [ ftp ftp-data telnet ssh ]; Read More...

Posted Monday, February 09, 2009 5:23 AM by jahil | 0 Comments

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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 Pakistan IEP Building 2nd Floor, Engineering Centre 97-B/D-1, Read More...

Posted Friday, February 06, 2009 11:45 PM by jahil | 0 Comments

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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 Read More...

Posted Wednesday, February 04, 2009 1:20 AM by jahil | 0 Comments

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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 Read More...

Posted Thursday, January 29, 2009 3:13 AM by jahil | 2 Comments

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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 Read More...

Posted Thursday, January 22, 2009 5:28 PM by jahil | 2 Comments

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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 Read More...

Posted Sunday, January 18, 2009 7:05 PM by jahil | 0 Comments

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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 Read More...

Posted Thursday, January 15, 2009 11:09 PM by jahil | 0 Comments

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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 Read More...

Posted Wednesday, January 07, 2009 10:42 PM by jahil | 1 Comments

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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 Read More...

Posted Monday, January 05, 2009 3:14 PM by jahil | 0 Comments

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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” Read More...

Posted Thursday, January 01, 2009 4:42 PM by jahil | 0 Comments

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