DHCP Relay agent on router in Packet tracer

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Dear all

in packet tracer i have a router(R1) that have 4 FastEthernet port.

Fa0/0: 70.80.4.1/24 ------> SW1(Layer2) -----> PC1 (DHCP Client)
Fa1/0: 70.80.5.1/24 ------> SW2(L2) ---------> PC2 (DHCP Client)
Fa8/0: 70.80.6.1/24 ------> SW3(L2) ---------> PC3 (DHCP Client)
Fa9/0: 70.80.7.1/24 ------> SW4(L2) ---------> PC4 (DHCP Client)
-------------------------------------------------
in subnet 4 (Fa9/0) i have a DHCP server and created 4 Scopes. pc4 get an ip address (70.80.7.3) but another pcs cannot get ip from DHCP that is on Fa9/0 side. please some body help me to configure router to pass DHCP Request and get an ip address in its range.

Best Wishes

 

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You will have to configure DHCP relay on all the other interfaces, since DHCP uses only a Layer2 Broadcast.
Using an IP HELPER you can tell your routers (or layer3 switches) to repackage that broadcast as a Layer 3 packet and send it to the DHCP server of your choice.

The command, under all your interfaces that are in another subnet, is:

ip helper-address <ip address of your dhcp-server>

Cisco IOS IP Command Reference, Volume 1 of 4: Addressing and Services, Release 12.3 T - IP Addressing and Services Commands: idle through ip local-proxy-arp  [Cisco IOS Software Releases 12.3 T] - Cisco Systems

 

Thanks Simonvm,
your solution resolved my problem.