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  • Fabio On IGRP
    the world A Distance Vector protocol simply gives a copy of it s routing table to it s neighbors and they alter the metric to reflect the added cost and merge it with their own routing table Priscilla Oppenheimer What sort of metric does IGRP use Fabio Oh my Dear Priscilla I will tell you IGRP uses a composite metric based on the lowest bandwidth along a route and the sum of the delay along the same route As you know this is a much superior metric than RIPs metric which is simply hhmmmmmm how do you say a quantity of leaps Priscilla Oppenheimer We would call RIPs metric a hop count What else makes IGRP better than RIP Fabio Well my inquisitive and sweet bundle of joy RIP only allows a network diameter of 15 hops where IGRP can support a network diameter of up to 255 hops although 100 is the default Priscilla Oppenheimer How often does IGRP send routing update Rip sends them every 30 seconds Fabio IGRP sends out updates every 90 seconds and it uses triggered updates and hold down timers just like RIP These features speed up convergence Priscilla Oppenheimer Is IGRP a published standard like RIP RIP is described in RFC 1058 Fabio IGRP was created by Cisco it only runs on Cisco routers There is no RFC as it was never submitted to the general public for comment Let me tell you what makes Cisco so special Would you like to hear why Cisco is so special my little dove Priscilla Oppenheimer Alright Fabio if you insist Fabio Cisco is a lot like Fabio beautiful and one of a kind Cisco invented the router Soon thereafter many imitators began selling routers but Cisco was the first just like Fabio was the first Cisco is the only company that actually created their own routing protocols like IGRP and EIGRP No other company can say that Not HP not 3 Com not Juniper no one Cisco is head and shoulders above the competition just like Fabio Priscilla Oppenheimer How do you configure IGRP on a Cisco router Fabio It is very easy my dear Fabio will show you Put your hands on the keyboard and Fabio will place his hands on top of yours Then I will teach you I will be gentle I will show you the ways of the Command Line Interface you have nothing to fear Fabio will protect you Fabio got his start posing for the covers of romance novels Romance novels are actually pornography for women Since there are no lewd explicit photos romance novels are all but unknown to men Fabio and Priscilla embrace He s not the sharpest pencil in the box but he s good looking and seems to be a nice guy Priscilla Priscilla Oppenheimer Look Casanova if you so much as touch my hands I will slap you so hard your kids will be dizzy Simply telling me the commands will be sufficient Fabio

    Original URL path: http://www.routergod.com/fabio/index.html (2016-04-27)
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  • Trinity explains IP Helper Addresses
    and give the client an IP address Mitch Well sure but why not just put your DHCP server in the same subnet as the client Problem solved Trinity Do you have a Microsoft MCSE certificate Mitch Yes Trinity I thought so Bill Gates has convinced you that you need a Windows DHCP server in every subnet hasn t he The truth is you only need one DHCP server and one as a backup You can configure a Cisco router to forward BOOTP broadcasts to the centralized DHCP server and save your company thousands of dollars Mitch Holy smokes How do you do that Trinity Just enter the command ip helper address followed by the address of the machine you want the broadcasts to be forwarded to Mitch Where does this command go Trinity You place the command on the interface you expect to be receiving the broadcast Mitch Does this command cause the router to forward all broadcasts Trinity By default the ip helper address command will forward these 8 UDP ports UDP PORT Common Name 69 TFTP 67 BOOTP Client 68 BOOTP Server 37 Time Protocol 49 TACACS 53 DNS 137 NetBios 138 NetBios Datagram Trinity is from the future A future where the Cisco routers and switches have taken over the earth In the future humans become the energy source that powers Cisco routers By the way if anyone should ask take the red pill You can thank us later Trinity is grief stricken after hearing that the Cisco stock she paid 70 a share for is now worth 18 per share Don t give up your day job Trinity Mitch OK Trinity cool What happens if I have a DHCP server but the interface with the ip helper address command receives a DNS query Will it forward it to my DCHP server Trinity Yes Any of these eight broadcasts will be sent to whatever address you have specified If those ports or services are not available on the target machine an ICMP Port Unreachable error message will be sent back This may have an impact on bandwidth Mitch What if I have several machines I want to send these broadcasts to do I have to enter this command once for every machine I want to target Trinity If the machines you are targeting are all on the same subnet like a server farm you can specify a directed broadcast Mitch Can I use one command to forward to a directed broadcast address and another command to specify unicast IP addresses of machines on other networks Trinity You bet You can mix and match Mitch If the ip helper address command can take a broadcast and turn it into a unicast must the target machine be directly on the other side of the router Trinity No you can use an address to any destination on your network Mitch How do the routers know how to get the packet to the target machine Trinity These are routers right That

    Original URL path: http://www.routergod.com/trinity/index.html (2016-04-27)
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  • Denise Richards On The PIX Firewall!
    Security Algorithm to perform Stateful Packet Inspection on traffic leaving the Firewall The PIX uses a real time embedded operating system to track the propriety of thousands of simultaneous connections JR Oh My God This sounds too complicated Let s forget about it maybe you should tell us how a console cable works or maybe which end of a power cord plugs into the wall Denise Ha Ha Don t be such a baby The PIX is easy It uses a Command Line Interface not one of those complicated GUI s like Checkpoint The PIX has 3 command modes User Mode Privileged Mode and Global Config Mode There is no concept of Interface Config Mode and the cool thing is that SHOW commands can be used at Global Config By default the PIX interfaces are shutdown To do a no shut on the outside interface you would use the following command interface ethernet0 auto To give it an IP address you would use a command like this ip address outside 192 168 1 1 255 255 255 0 JR Wow You really know your PIX Firewalls Denise What do you think I m just a hot babe Now lets configure Network Address Translation It consists of 2 steps defining the inside users eligible for outbound connections and defining the pool of global IP addresses to be translated into If you wanted all your users to use NAT the command would be nat inside 1 0 0 0 0 0 0 0 0 The 1 in this command is the NAT ID it must match the NAT ID in the global command which I ll show you in a minute The fields 0 0 0 0 and 0 0 0 0 are IP Address and Netmask respectively The PIX will let you abbreviate a default field with a single zero Here is an example nat inside 1 0 0 The next step is to define the pool of global IP addresses Let s say that you have the range 192 168 1 2 through 192 168 1 6 24 The command would be global outside 1 192 168 1 2 192 168 1 6 netmask 255 255 255 0 Don t forget that the IP address of the PIX s outside interface cannot be in the pool of global addresses JR So now the users on the inside can get out In a small network how does the inside traffic that is destined for the outside world know about the PIX Denise If it s a small network like one subnet and no internal router just configure all the workstations Default Gateway with the IP address of the PIX s inside interface If there is an internal router between the PIX and your users the workstations will naturally have the router as the Default Gateway and the router will have a default static route pointing to the PIX If there are internal networks on the other side of your internal router

    Original URL path: http://www.routergod.com/deniserichards/index.html (2016-04-27)
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  • Gary Coleman Talks about Priority Queuing
    should just call it a little frame we would get the picture You know what I m say n Okey Dokey priority queuing yeah ok Nuth n to it but to do it Priority queuing like all methods of queuing can only be enabled on interfaces with bandwidths less than 2 048 Mbps In other words you aint gonna configure queuing on an ethernet interface So it s for a WAN link like ISDN or frame relay Now listen up people If your link is already overloaded queuing won t help It s only to prioritize time sensitive traffic over lower priority traffic With Priority Queuing you can have up to 4 queues They are called high medium normal and low Priority queuing is configured using the priority list command The priority list assigns incoming packets to each of the 4 queues based on arguments you configure The high priority queue is always emptied first then the medium queue gets emptied Next the normal queue gets emptied and finally the low queue gets emptied If the high queue is always full and never gets emptied none of the other queues will ever get serviced That sucks This is why you probably don t want to use priority queuing you probably want to use custom queuing Oh one more thing people if a lower priority queue is getting serviced and traffic arrives into a higher priority queue you guessed it the router forgets all about the queue it was servicing and immediately takes care of the higher priority queue Now that I think of it Hollywood runs the same way Now check this out you had better assign a default queue for traffic that you forgot to include in the other queues Use the priority list default command Your boss swore

    Original URL path: http://www.routergod.com/garycoleman/index.html (2016-04-27)
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  • Agent Smith On Syslog!
    significant condition 6 info a purely informational message 7 debug messages generated to debug the application Agent Smith adjusts a Windows 2000 Server Nortel Routers are a disease a cancer of this planet They are a plague And we are the cure Jenny Vo Oh wow This is pretty neat You must be Agent Smith the avatar that Cisco s IOS uses in upcoming releases Agent Smith I d like to share a revelation that I ve had during my time here It came to me when I tried to classify your species I ve realized that CCNAs are not actually mammals Jenny Vo Tell me something I don t know Whatever explain to me what SYSLOG is after all that s why I m here Agent Smith Very well Jenny Vo Syslog is simply a messaging utility It s off by default on Cisco routers The router con be configured to send messages to a host on the network that is running syslog software this software enables the host to capture and store the messages Jenny Vo So the router sends messages to a syslog server what protocol does it use to send these messages Agent Smith These messages are sent using UDP the destination port is 514 Jenny Vo OK great How do you tell the router where the server is Agent Smith You must type in a command at global config mode Assume that the server is at 10 1 1 1 matrix config logging host 10 1 1 1 Jenny Vo OK now that s easy what s next Agent Smith You must select a logging level You must be careful here it is easy to generate huge logs that will be difficult to examine later You can choose from eight levels of messaging For example

    Original URL path: http://www.routergod.com/agentsmith/index.html (2016-04-27)
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  • Alicia Silverstone on Basic ISDN Configuration
    carries signaling for call setup and teardown that s why ISDN calls connect so quickly Erwin You re right about that ISDN calls set up quickly Alicia Duh I just said that There s more to ISDN than what setting up the call ya know Like you have to know the ISDN Switch Type the guy at the phone company tells you that It could be an AT T 5ESS or a DMS 100 or they have others too Some switches require you to configure SPIDs isn t that a cool sounding name On a BRI interface you would need to configure a SPID for each B channel but the phone guy will tell you if you need SPIDs You also have to configure other stuff too like a dialer list and don t forget you need an IP address too Erwin How would you go about configuring ISDN Alicia Well if it was me I d configure the ISDN switch type first You can do that globally or at the interface it doesn t matter Erwin But isn t it true that if you do it globally it will be applied to all ISDN interfaces on the router and if you configure the switch type at the interface it applies only to that specific interface Alicia Huh Yeah that seems right Erwin What is the command to configure the switch type Alicia That s easy its isdn switch type followed by the actual switch type you can enter a question mark if you need help Erwin Super how would you configure SPIDs Alicia You have to you to the BRI interface on my router I always enter interface bri 0 0 and hit enter Then you are at the BRI interface it has these little parentheses and inside they say config if anyway you have to configure 2 spids but only if the telco switch requires it you go isdn spid1 and enter the SPID number then go isdn spid2 and enter the other SPID number It s pretty simple Erwin What s next Alicia Now would be a good time for an IP address you would enter ip address 172 16 1 1 255 255 0 0 and push down on the enter key again Here is where I enter the encapsulation I go encapsulation ppp and I hit enter I like ppp encapsulation because it lets you do stuff like authentication Next I enter ppp authentiction chap Erwin Authentication What for Alicia rolls her eyes OH MY GOD ISDN is essentially just a telephone call Do you want every gnarly surfer dude from the valley calling your router No waa aay Like hello Is Alicia home I m sure Next thing to configure is a dialer list to define interesting traffic Erwin Interesting traffic Do you mind explaining to our readers what you mean by that Alicia No Prob ISDN is expensive you pay by the minute and it can really add up Your ISDN interface will

    Original URL path: http://www.routergod.com/aliciasilverstone/index.html (2016-04-27)
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  • Charles Manson on Floating Static Routes
    creator of the floating static route is that so Charlie Damn straight I did sonny boy Somebody had to do it and as usual everybody said let Charlie do it But that was your thought because the world is yours I m just in your world I m in your world with your permission and I can only exist with your permission because if you don t want me to exist then I will live in another dimension Tom OK why a floating static route Can you explain Charlie Well here s the deal a Cisco router will always chose a static route over any route learned by a routing protocol Cisco routers love static routes because they always have a lower administrative distance than a route learned dynamically Tom That makes sense a static route should be given preference Charlie It makes sense to you because you are part of the big plan the New World Order is in cahoots with the ancient Egyptian men to smuggle the future into the past What if you want a static route to have a higher administrative distance than a route learned from say OSPF How would you achieve that Tom I still don t understand why would I want to change the administrative distance of a static route Charlie Say you have a router at a remote office connected to the main office using frame relay The router at the remote site is running OSPF and getting Hello packets across the frame link everything is cool But say you wanna have a backup dial interface come up in case the frame relay link bombs Since OSPF has an administrative distance of 110 and a static route has an administrative distance of 1 when everythings fine the router will route packets through

    Original URL path: http://www.routergod.com/charlesmanson/index.html (2016-04-27)
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  • Anna Nicole Smith on the 1900 series switch.
    know I just collect them The Cisco reseller comes by every Thursday He leaves six or seven 5 packs of switches on my doorstep I now have over 400 Catalyst switches in my collection Tom Wow 400 switches that s a lot Are they all 1900s Anna Yeah 1912s and 1924s Some are Enterprise version Hey are you hungry Can we order appetizers I want a drink too Anna motions to the queer gay waiter and we order Escargot and martinis Oh yeah where were we my switches Yepper I got lots of switches Tom Can you explain the differences between the different 1900 series switches Anna Sure baby cakes OK here s the deal there are 2 types you can order the Standard version and the Enterprise version Then there are 2 basic models the 1912 and the 1924 Tom Oh I think I get it The 1912 has 12 Ethernet ports right Anna Nope it has 14 Tom 14 That doesn t seem to make sense Can you explain that Anna Well the 1912 has 12 10BaseT ports and Cisco gives you 2 bonus 100BaseT ports Likewise the 1924 has 24 10 Megabit Ethernet ports and 2 Fast Ethernet Ports And don t forget you can order these as either Standard or Enterprise Tom Why is there only 2 Fast Ethernet ports and 12 or 24 regular Ethernet ports why not just make them all Fast Ethernet ports and be done with it Anna Why not 100 Fast Ethernet ports The fact is this is a low end switch aimed at wiring closets and hub replacements This is an inexpensive switch the standard version of the 1912 is about 900 A 1924 Enterprise version is about 1700 So you see these are very affordable for small businesses that

    Original URL path: http://www.routergod.com/annanicolesmith/index.html (2016-04-27)
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