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DHCPRelay_through_GRE.rst

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DHCP Relay trough GRE-Bridge

Testdate: 2023-12-28
Version: 1.3.5
Upgrade Version: 1.5-rolling-202312261220

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.

Ansible Example topology image

Configuration

First, we configure the transport network and the Tunnel interface.

Transport:

_include/transport.conf

DHCP-Server

_include/dhcp-server.conf

DHCP-Relay

_include/dhcp-relay.conf

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

_include/dhcp-server.conf

DHCP-Relay

_include/dhcp-relay.conf

Test the result

Ping the Client from the DHCP Server.

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=0.960 ms
64 bytes from 192.168.0.30: icmp_seq=2 ttl=63 time=1.03 ms
64 bytes from 192.168.0.30: icmp_seq=3 ttl=63 time=1.18 ms
64 bytes from 192.168.0.30: icmp_seq=4 ttl=63 time=1.20 ms

--- 192.168.0.30 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 7ms
rtt min/avg/max/mdev = 0.960/1.093/1.200/0.100 ms

And show all DHCP Leases

vyos@dhcp-server:~$ show dhcp server leases
IP address    Hardware address    State    Lease start          Lease expiration     Remaining    Pool        Hostname
------------  ------------------  -------  -------------------  -------------------  -----------  ----------  ----------
192.168.0.30  00:50:79:66:68:05   active   2023/12/28 12:34:56  2023/12/29 12:34:56  23:59:16     DHCPTun100  VPCS