Archive for June, 2010

no keepalive up/up

| June 25th, 2010 | 9 Comments »

I learned this new trick from reading an old CCIE book. If you want to keep an interface with up/up status with no cable connected to it, especially for simulation purposes all you have to do is disable the keepalive like so: Router#sh ip int brie Interface                  IP-Address      OK? Method Status                Protocol FastEthernet0/0            unassigned      YES unset  administratively down ...

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iPhone 4 wi-fi solution

| June 24th, 2010 | 2 Comments »

There are reports of the new iPhone 4 causing wireless issues if you hold the phone properly. Basically, holding it like a normal person. You can read the full article here. http://gizmodo.com/5571171/iphone-4-loses-reception-when-you-hold-it-by-the-antenna-band This is a reader video found on Macrumors forums illustrating something weird. When the guy holds the iPhone in his hands, touching the outside antenna ...

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VLAN Access Lists Lab#01

| June 23rd, 2010 | 8 Comments »

You can learn all you want about ACL's until you're blue in the face, but what if the traffic never traverses an interface? How do you control traffic within a VLAN? That's where VACL's come in. VLAN access-lists can handle packets within a VLAN since there are no actual IN/OUT direction to be applied as you ...

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Frame Relay LMI Autosense Lab#02

| June 21st, 2010 | 2 Comments »

In this lab, we're going to take a look at autosensing the LMI signaling protocol. As we've seen in Lab#01, you need this to be correct in order to bring the link up. We'll start with the frame relay switch configuration. FRAME RELAY SWITCH RTR-3620#config t RTR-3620(config)#frame-relay switching RTR-3620(config)#int s1/1 RTR-3620(config-if)#encapsulation frame-relay RTR-3620(config-if)#clock rate 64000 RTR-3620(config-if)#frame-relay intf-type dce RTR-3620(config-if)#end RTR-3620#sh run int s1/1 Building configuration... Current configuration ...

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Frame Relay Switch Lab#01

| June 20th, 2010 | 5 Comments »

In this lab, we're going to hit two birds with one stone. We're going to learn how to configure Cisco routers for frame relay, as well as the configuration for the actual frame relay switch. The frame relay switch will be a regular router. In this case, it's going to be a 3620 router that ...

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Securing a Trunk

| June 16th, 2010 | No Comments »

Here's another lab from Dave Hucaby. As always, please try to do them yourself before looking at the possible answers below: http://dhucaby.wordpress.com/2010/06/15/scenario-2-securing-a-trunk/ Dave's original question: Today’s scenario involves securing a trunk between two switches… A user PC A is located on Switch A with the interface configuration shown in the diagram below. A different user PC X is located ...

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