Networking problem urgent !

[ccnamonsun]

I have c-1700 router & i have 4 diferent network ids.

now i want to use a win 2000 server form one network segment work as a DHCP server for all four network segment & I want to connect all segment through a router. how can i do it.

Plz. reply.

sunil phogat

[paddyxdoyle]

Hi,

I am guessing you have a Cisco switch here with four VLANs configured??

You need to find out if your model of 1700 supports trunking, will probably be dot1q

You can then connect one of your switch ports to your routers Fast Ethernet Interface.

Set the switch port to trunk:

int fa 0/24

switchport access vlan 2

switchport mode trunk

switch trunk encapsulation dot1q

speed 100

duplex full

!this will trunk all VLANS, you can configure the interface to only trunk specific VLANs using "switchport trunk allowed....."

Then on your router, set your fast ethernet interface duplex to full and speed to 100 and then configure sub interfaces as VLAN trunks:

Note this example assumes vlan 2,4,6 & 8 are being trunked and your DHCP server is on VLAN 6 with IP address 1.1.1.1. Vlan 2 is your Native VLAN, i.e. the actual VLAN your switchport is logically in (PVID).

int fa 0/0

speed 100

duplex full

int fa 0/0.2

encapsulation dot1q 2 native

ip helper-address 1.1.1.1

int fa 0/0.4

encapsaulation dot1q 4

ip helper-address 1.1.1.1

int fa 0/0.6

encapsulation dotq 6

.

int fa 0/0.8

encapsulation dotq 8

.

ip helper-address 1.1.1.1

HTH

Paddy

[ccnamonsun]

Dear paddy,

I have cisco-1700 router & i have 4 diferent network ids.

now i want to use a win 2000 server form one network segment to work as a DHCP server for all four network segment & I want to connect all segment through a router to communicate with each other. How can i do it.(I am using simple switch without VLAN)

Plz. reply.

sunil phogat

[paddyxdoyle]

Hi,

You can use secondary addresses on your Fast Ethernet interface to enable routing between your different network IDs, however i am not sure whether the "ip helper-address" will work between your different network IDs,

If you can try this, then your config would look something like:

int FastEthernet 0/0

ip address 1.1.1.1 255.255.255.0

ip address 2.2.2.1 255.255.255.0 secondary

ip address 3.3.3.1 255.255.255.0 secondary

ip address 4.4.4.1 255.255.255.0 secondary

ip helper-address 1.1.1.2

Let me know how you get on

Rgds

Paddy