DHCP Troubleshooting

DHCP Troubleshooting

From: GNS3 Vault (1) Thanks to Rene Molenaar for taking the time to post these practice labs on his site.

• Router DHCPClient1 needs to obtain an IP address through DHCPServer on its fa0/0 interface
• Router DHCPClient2 needs to obtain an IP address through DHCPServer on its fa0/0 interface
• Only Router DHCPServer can hand out IP’s

Installing SDM on a Virtual Machine and 3725 Router (GNS3)

(as a personal reference dedicated to Nanook)

The router configs for this post came from “Installing SDM” (1) YouTube video posted by "Cisco Learning Institute" (CSSIAdotORG)

I'm installing SDM-V25 (Cisco’s Security Device Manager) on a c3725 in GNS3 from a WinServer 2008 VM. I’m sure you can use an XP VM to do this. Note that SDM is EoL (End-of-Life) and is replaced (?) by CCP (Cisco Configuration Professional)… but I believe, at this time, SDM is still in the CCNA Security curriculum (?). See: http://www.cisco.com/en/US/products/sw/secursw/ps5318/index.html

Switched network with external DHCP Server (WinServer 2008) Part 1

I wanted to setup an external DHCP server to:

1. See if I could figure out how to do it
2. Practice the security part of the Switch exam and
3. See if I can introduce a rouge DHCP server… the plan is to have PC-2 go rouge.

Part 1 goes over the basic DHCP Server configurations (on WinServer 2008).

Switched Network with an External DHCP Server (WinServer 2008) Part 2

Part 2 continues with the switch configurations along with PC- 1 & 2 getting their IP address from the external server….

IP SLA on 2950s

Is not supported!

2950(config)#ip s?
security  source-route  sticky-arp  subnet-zero

Instead, to configure two 2950s as IP SLA responders, configure them as rtr responders. 

No Tclsh? No Problem!

I’m shocked and appalled to have just discovered my 3550’s don’t support scripting with tcl. Actually, the 3560’s don’t either. But, thanks to a posting on CCIE Pursuit Blog a macro can be used to substitute a tcl ping script. The macro needs to be run in global configuration mode so you’ll need to include the ‘do’ statement.

Basics: Switches, VirtualBox and GNS3

Getting your physical switches to talk to virtual machines and GNS3 routers.