12-09-2025 09:22 AM
Hello all,
DHCP relay is configured on the firewall over SDWAN the device acquire the IP normally but after some days it stop working and need to clear the session so any device can acquire an IP.
The DHCP relay was working fine before implanting the SDWAN no issues at all but after the integration of SDWAN the issue start so what could be wrong which led to this behavior.
PA-410> show session all filter application dhcp -------------------------------------------------------------------------------- ID Application State Type Flag Src[Sport]/Zone/Proto (translated IP[Port]) Vsys Dst[Dport]/Zone (translated IP[Port]) -------------------------------------------------------------------------------- 16250 dhcp ACTIVE FLOW 172.16.12.1[67]/LAN/17 (172.16.12.1[67]) vsys1 192.168.3.200[67]/zone-to-hub (192.168.3.200[67]) 14499 dhcp ACTIVE FLOW 172.16.12.1[67]/LAN/17 (172.16.12.1[67]) vsys1 192.168.0.200[67]/zone-to-hub (192.168.0.200[67])
no discard state but DHCP sessions seem to be stuck in the firewall, and that these sessions have been active for more than 6 hours.
PA-410 > show session id 16250
Session 16250
c2s flow:
source: 172.16.12.1 [LAN]
dst: 192.168.3.200
proto: 17
sport: 67 dport: 67
state: ACTIVE type: FLOW
src user: unknown
dst user: unknown
fwd cache: {FIB} cached
fib: 12587 hit(s), 93 miss(es)
sdwan rule: N/A path: tunnel.915
sdwan FEC: Unknown
s2c flow:
source: 192.168.3.200 [zone-to-hub]
dst: 172.16.12.1
proto: 17
sport: 67 dport: 67
state: ACTIVE type: FLOW
src user: unknown
dst user: unknown
sdwan rule: N/A path: [N/A]
start time : Mon Dec 8 08:03:13 2025
timeout : 30 sec
time to live : 28 sec
total byte count(c2s) : 4126161
total byte count(s2c) : 32774
layer7 packet count(c2s) : 11919
layer7 packet count(s2c) : 93
vsys : vsys1
application : dhcp
rule : ACCESS
service timeout override(index) : False
session to be logged at end : True
session in session ager : True
session updated by HA peer : False
software fast forwarding : False
layer7 processing : enabled
ctd version : 3
PAN-OS 11.1.10-h1
SDWAN plugin version 3.2.3-h2
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