Category Archives: mecha

Cisco Router – Configuring NTP Client and Server

Doc: Great Scott! Jennifer could conceivably encounter her future self! The consequences of that could be disastrous! Marty: Doc, what do you mean? Doc: I foresee two possibilities. One, coming face to face with herself 30 years older would put her into shock and she’d simply pass out. Or two, the encounter could create a […]

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Cisco Router – Configuring Time Manually

Marty: You’re not gonna believe this. We have to go back to 1955 Doc: I don’t believe it! Marty: That’s right, Doc. November 12th, 1955. Doc: Unbelievable that Old Biff could’ve chosen that particular date. It could mean that that point in time inherently contains some sort of cosmic significance, almost as if it were […]

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Cisco ASA – 802.1q VLAN Tagging

The Cisco ASA supports 802.1q tagging, which inserts a tag into the original Ethernet frame. The 802.1q tag contains 4 fields: TPID (Tag Protocol Identifier) 16-bit field. A value of 0x8100 identifies the frame as an IEEE 802.1q-tagged frame. Priority 3-bit field describing the frame priority level. Value can range from 0 to 7. CFI […]

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Cisco ASA 5520 – Creating Subinterfaces

5:05 p.m. at the courier’s office. Me and the cabling guys arrive to do the network cutover. We knock on the funny little door where customers pick up their packages. It is a Dutch door, split horizontally at waist-level like a stable door. During business hours, they swing open the upper half of the door, […]

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Cisco ASA 5520 – Basic Interface Configuration

The Cisco ASA 5520 is one of the mid-range ASAs. 4 Gigabit Ethernet ports. Max 450 Mbps throughput under ideal conditions. Good for mid-sized offices. Has an expansion slot where you can install an add-on card that does content filtering (e.g. email and web) or intrusion prevention. Or you can install an expansion card that […]

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