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Solved: How do I interpret the NPU Offload field in FortiOS session lists?

Scope

FortiOS 6.2.x, 6.4.x, 7.0.x, 7.2.x

Solution

The following is an example output for a session list captured in FortiOS:

# diagnose sys session list
session info: proto=6 proto_state=01 duration=600125 expire=3585 timeout=3600 flags=00000000 socktype=0 sockport=0 av_idx=0 use=3
origin-shaper=
reply-shaper=
per_ip_shaper=
class_id=0 ha_id=0 policy_dir=0 tunnel=/ vlan_cos=0/255
state=log may_dirty npu f00
statistic(bytes/packets/allow_err): org=1406688/22871/1 reply=1406629/22870/1 tuples=2
tx speed(Bps/kbps): 2/0 rx speed(Bps/kbps): 2/0
orgin->sink: org pre->post, reply pre->post dev=9->17/17->9 gwy=0.0.0.0/0.0.0.0
hook=pre dir=org act=noop 10.218.3.68:10608->10.228.3.115:179(0.0.0.0:0)
hook=post dir=reply act=noop 10.228.3.115:179->10.218.3.68:10608(0.0.0.0:0)
pos/(before,after) 0/(0,0), 0/(0,0)
src_mac=02:09:65:3a:0d:01 dst_mac=00:09:0f:09:00:03
misc=0 policy_id=1 pol_uuid_idx=14726 auth_info=0 chk_client_info=0 vd=0:1
serial=00000123 tos=ff/ff app_list=0 app=0 url_cat=0
rpdb_link_id=00000000 ngfwid=n/a
npu_state=0x4000c00 ofld-O ofld-R
npu info: flag=0x81/0x81, offload=9/9, ips_offload=0/0, epid=136/128, ipid=128/136, vlan=0x0000/0x0000
vlifid=128/136, vtag_in=0x0000/0x0000 in_npu=1/1, out_npu=1/1, fwd_en=0/0, qid=4/4

The offload field here shows a value of 9/9. This indicates the forward direction and reverse direction, respectively.

See the following table to identify what each possible number value means:

See the following table to identify what each possible number value means.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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