topic DHCP issue in General Topics

DHCP issue

altaf.uom — Mon, 21 Aug 2023 12:36:07 GMT

We are currently experiencing an issue with our network setup that involves the DHCP server, Palo Alto firewall, core switch, and access switches.

Our DHCP server is connected to the Palo Alto firewall, followed by our core switch and access switches. The problem arises with VLAN-503, where the gateway is located in the firewall. However, in the core switch, there is no SVI configured for VLAN 503. As a result, clients are unable to obtain IP addresses within this setup.

Strangely, when we manually configure the SVI for VLAN 503 on the core switch, clients are then able to successfully receive IPs from the DHCP server.

Need support.

Re: DHCP issue

BPry — Mon, 21 Aug 2023 16:43:15 GMT

@altaf.uom,

Putting together a network diagram and actually explaining your network and how you have things configured would go a long way in providing enough detail for people to assist with this. Keep in mind that nobody knows how you have things configured but you, so trying to answer a question like this would require a whole lot of assumptions being made that may not be correct in this instance.

When you enable interzone-default logging do you see any denied traffic from clients to your DHCP server?
Are you using DHCP-Relay on the firewall for the 503 interface?
Do you have ip helper-address(es) configured on your VLAN at all?