V21 DHCP Relay

From which version did you perform a firmware update?

We addressed some issues in the past. 

 LHerzog might be able to comment on it as well. 

Hi Toni,

SFOS 20.0.2 MR-2-Build378

Hello,

Could you please share some more details? For example,

- How many DHCP relay are configured? and topology?

- Do you use DHCP server or DHCP client in SFOS along with relay?

- Do you see any service dead on control center?

- Connectivity confirmation between relay and server.

- Packet capture or tcpdump on "port 67" while client is requesting IP via DHCP?

- Could you please try updating one of the DHCP relay and check whether it starts working?

Hello,

- How many DHCP relay are configured? and topology?

16 relays are configured.
All relays point to the same domain controller. Everything worked before upgrading to V21. When you downgrade to the previous version everything works again

- Do you use DHCP server or DHCP client in SFOS along with relay?

Yes, SFOS also provides four DHCP servers

- Do you see any service dead on control center?

all services have started

- Connectivity confirmation between relay and server.

The connection and server are OK. When downgrading from SFOS everything works again

- Packet capture or tcpdump on "port 67" while client is requesting IP via DHCP?

Sorry, I don't have one at the moment

- Could you please try updating one of the DHCP relay and check whether it starts working?

I have already deleted a relay and recreated it again. Unfortunately without success

we've had non working DHCP relays in older versions (19.5.3). did not happen again recently (for months) since v20,  currently we're on v21.

Relays point to a DHCP server in a separate VLAN, routed by XGS.

Solution to get it work was for us: delete random DHCP relay object on XGS, then recreate it. DHCP relay was working again.

case: 07174270 

what is the current setting on your firewall:

console> system dhcp conf-generation-method show

new or old?

we've changed from old to new half a year ago and had no issues since.

Could you please share access ID via DM to further debug?

DHCP configuration generation is related to DHCP server.

Are you saying that changing this generation method helped in resolving "DHCP relay" issue for you?

if it was not fixed in the v20 code, it may have helped, yes.

GES support mentioned, they had seen things happening in the logs that should receive improvement by DEV. Cannot tell exactly what it was.

Would be interesting if Administrator User327  has also REDs configured on the firewall.

Hi, 

output is "old"