Dhcrelay - Dynamic Host Configuration Protocol Relay Agent. ServerN ] dhcrelay -6 [ -dqI ] [ -p port ] [ -c count ] [ -pf pid-file ] [ --no-pid ] -l lower0 [. DHCP Relay Agent, dhcrelay, provides a means for relaying DHCP and BOOTP requests. Naming Scheme for Network Devices Available for Linux on System z 8.5. The DHCP Relay Agent (dhcrelay) enables the relay of DHCP and BOOTP requests from. See Section 9.3.2, “Configure dhcrelay as a DHCPv6 relay agent”. And BOOTP relay agent (by default) or as a DHCPv6 relay agent (with -6 argument). Overview The DHCP server can only dynamically distributing network configuration parameters to the client computers within the same network with DHCP server. For client computers that reside a separated networks to get the network configuration parameters from DHCP server, we need a DHCP relay server. In this article you will see how to install and configure DHCP relay server on Huawei L3 switch model CE6800. Prerequisites In this tutorial, it is supposed that: a. You have already installed DHCP server up and running. In case that you don’t, you would probably like to read this link. You have the SSH remote access to Huawei L3 switch. System Architecture Diagram There are three VLANs on Huawei L3 switch. The DHCP server locates in VLAN 10. For DHCP server to dynamically distributing network configuration parameters to clients computers locate in another separated VLANs which are VLAN20 and VLAN30, we need to configure DHCP relay on Huawei L3 switch. The DHCP relay need to apply on the interface or VLAN that connect the clients. It is no need to apply DHCP relay on the interface or VLAN that connect to DHCP server. So, in our case just need to apply DHCP relay configuration on interface VLAN 20 and interface VLAN 30 only. Configure VLAN Interface Let configure the VLAN interfaces for VLAN 10, VLAN 20, and VLAN 30 ] vlan 10 name VLAN-Servers ] vlan 20 name VLAN-Client01 ] vlan 30 name VLAN-Client02 ] int vlan 10 ip address 10.0.10.1 255.255.255.0 ] int vlan 20 ip address 10.0.20.1 255.255.255.0 ] int vlan 30 ip address 10.0.30.1 255.255.255.0 Now we need to assign the switch ports to the associated VLANs. ![]() ] int GE1/0/1 desc DHCP-Server_NIC01 undo shutdown port default vlan 10 ] int GE1/0/2 desc Client-PC01 undo shutdown port default vlan 20 ] int GE1/0/3 desc Client-PC02 undo shutdown port default vlan 30 5. Configure DHCP Relay To configure DHCP relay on Hauwei L3 switch model CE6800, execute the following commands on VLANs that connect the client, which are interface VLAN 20 and VLAN30. ] dhcp enable ] int vlan 20 dhcp select relay dhcp relay binding server ip 10.0.10.1 ] int vlan 30 dhcp select relay dhcp relay binding server ip 10.0.10.1 6. Test DHCP Relay To verify if the DHCP relay is working on VLAN 20, we can plug the client computer to port GE1/0/2 which was configured for VLAN 20. Gundam vs. zeta gundam gamecube iso. The client computer should be able get the IP as the the following. Also, to verify if the DHCP relay is working on VLAN 30, we can plug the client computer to port GE1/0/3 which was configured for VLAN 30. The client computer should be able get the IP as the the following. Conclusion Now you just have done the configuration of DHCP relay server on Huwei L3 switch model CE6800. I hope that you can find this instruction informative. If you have any questions or suggestions you can always leave your comments below. I will try all of my best to review and reply them. ![]() We are trying to organize a VLAN (say VLAN 1) for guests who must be assigned IP addresses from a DHCP server in a different VLAN (VLAN 2). This DHCP server is configured with two scopes - 172.16.0.0/24 (for VLAN 2) and 172.16.4.0/24 (for the Guests VLAN 1). The DHCP server successfully distributes addresses to clients in its VLAN (it has the IP address 172.16.0.2). For the clients in the other VLAN a DHCP Relay Agent has been setup on the router. It is DHCRELAY running on Linux (CentOS) which has been configured to accept the DHCPDISCOVER broadcasts coming on the VLAN1 interface of the router and forward these to the DHCP server. The IP address of the VLAN1 interface of the router is 172.16.4.254 and on the VLAN2 interface - 172.16.0.254 The problem is that the DHCP server won't respond with a DHCPOFFER message to the relay agent. I have traced the frames on the router and on the DHCP server. They arrive on the DHCP server with the correct GIADDR of the relay agent. According to all documentation, if a scope has been configured on the DHCP server and it receives a unicast message with the GIADDR set by a relay agent that matches one of the configured scopes, the DHCP server must send a unicast DHCPOFFER to the relay agent. But it doesn't. Here is what Wireshark reports (ignore the Destination port unreachable messages, the DHCP service was stopped at the time Wireshark was running) When the service is running, there are just DHCPDISCOVERs - no OFFER. You can see that the server has the two scopes configured: The relay agent seems to work normally - it forwards the DHCPDISCOVERs to the server continuously (tried many times with ipconfig /renew on the client). I read many posts about this problem. Some users had other services running on the DHCP server that used the DHCP port, but I don't have such an issue (you see that when the service is stopped, an ICMP port unreachable is sent which is correct). Others however did not find a solution. Am I missing something? Is there something specific when using the DHCRELAY agent from DHCPD?
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