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Beginner

2950 and Cable Router

Hi,

I just picked up a 24 port Catalyst 2950 to expand my home network and learn a bit more about networking. Having just upgraded the IOS software 'm now trying to get this to work as required on my network but I'm having a few issues.

My intentions are to plug my cable router/modem wan connection which is set up as the dhcp server to fa 0/1, then use fa 0/2 - 24 for the rest of my wired network. So essentially all on the same subnet interfacing with the router 192.168.0.1.

So far I have set up all of the security on the switch, and have all switch ports assigned to vlan1 with no IPs. My laptop connected to fa0/2 however is not assigned an ip address. Looking at a few posts I ahve rightly or wrongly played about with dhcp snooping.

Config

Current configuration : 2205 bytes                                             

!                                                                              

version 12.1                                                                   

no service pad                                                                 

service timestamps debug uptime                                                

service timestamps log uptime                                                  

service password-encryption                                                    

!                                                                              

hostname Cisco2950                                                             

!                                                                              

enable secret 5 $1$1EA5$w0rV3F7kdfZ6sCwVQR4/H.                                 

!                                                                              

ip subnet-zero                                                                 

!                                                                              

ip dhcp snooping vlan 1                                                        

ip dhcp snooping information option allow-untrusted                            

ip ssh time-out 120                                                            

ip ssh authentication-retries 3                                                

!                                                                              

spanning-tree mode pvst                                                        

no spanning-tree optimize bpdu transmission                                    

spanning-tree extend system-id

What am I doing wrong?

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Accepted Solutions
Hall of Fame Community Legend

2950 and Cable Router

My laptop connected to fa0/2 however is not assigned an ip address.

Maybe because portfast isn't enabled on each port?

Honestly, now.  DHCP snooping on a home network?  Who's going to hack into your home network? 

View solution in original post

3 REPLIES 3
Hall of Fame Community Legend

2950 and Cable Router

My laptop connected to fa0/2 however is not assigned an ip address.

Maybe because portfast isn't enabled on each port?

Honestly, now.  DHCP snooping on a home network?  Who's going to hack into your home network? 

View solution in original post

Beginner

Re: 2950 and Cable Router

Portfast on fa 0/2 - 24 worked a treat. Thanks.

As for DHCP snooping - you don't know my neighbours! In all seriousness I was just playing around with the settings.

Now looking at getting a bit more complicated, how do I set up a management vlan with a dhcp assigned ip address (from the router) so I can telnet/ssh in to the switch? I'm scared of setting up a vlan 2 with an ip and breaking everything now it's working.

Hall of Fame Community Legend

Re: 2950 and Cable Router

Ok. Thanks. Didn't know the portfast worked as I just took a guess.

How complicated is the DHCP? You can set the 2950 as a DHCP server.

Management IP address: you can only have ONE management ip address on a 2950.

If your neighbors are "good" then I'd recommend you stay away from using Vlan 1

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