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# DHCP Relay through GRE-Bridge
```{eval-rst}
| Testdate: 2023-05-11
| Version: 1.4-rolling-202305100734
```
This simple structure shows how to configure a DHCP Relay over a GRE Bridge
interface.
## Topology
The topology has 3 VyOS routers and one client. Between the DHCP Server and
the DHCP Relay is a GRE tunnel. The `transport` VyOS represent a large
Network.
```{image} _include/topology.webp
:alt: Ansible Example topology image
```
## Configuration
First, we configure the transport network and the Tunnel interface.
Transport:
```{literalinclude} _include/transport.conf
:language: none
```
DHCP-Server
```{literalinclude} _include/dhcp-server.conf
:language: none
:lines: 1-8
```
DHCP-Relay
```{literalinclude} _include/dhcp-relay.conf
:language: none
:lines: 1-8
```
After this, we need the DHCP-Server and Relay configuration.
To get a testable result, we just have one IP in the DHCP range.
Expand it as you need it.
DHCP-Server
```{literalinclude} _include/dhcp-server.conf
:language: none
:lines: 9-13
```
DHCP-Relay
```{literalinclude} _include/dhcp-relay.conf
:language: none
:lines: 9-10
```
## Test the result
Ping the Client from the DHCP Server.
```none
vyos@dhcp-server:~$ ping 192.168.0.30 count 4
PING 192.168.0.30 (192.168.0.30) 56(84) bytes of data.
64 bytes from 192.168.0.30: icmp_seq=1 ttl=63 time=1.02 ms
64 bytes from 192.168.0.30: icmp_seq=2 ttl=63 time=1.06 ms
64 bytes from 192.168.0.30: icmp_seq=3 ttl=63 time=1.21 ms
64 bytes from 192.168.0.30: icmp_seq=4 ttl=63 time=1.16 ms
--- 192.168.0.30 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 1.016/1.112/1.214/0.077 ms
```
And show all DHCP Leases
```none
vyos@dhcp-server:~$ show dhcp server leases
IP Address MAC address State Lease start Lease expiration Remaining Pool Hostname
------------ ----------------- ------- ------------------- ------------------- ----------- ---------- ----------
192.168.0.30 00:50:79:66:68:05 active 2023/05/11 13:08:50 2023/05/12 13:08:50 23:59:16 DHCPTun100 VPCS
```
|
