trex on proxmox and PCI passthrough

[brendana...@gmail.com]

Team, I have moved off ESXi and on to Proxmox.  I have the VM set to q35 machine type and IOMMU enabled on the host and guest(trex).  I can't get arp to work.  It seems the broadcast traffic is somewhere dropped before it gets to the Trex instance.  I ran this setup very successfully on ESXi with PCI passthrough.  I can run in L2 mode and pass traffic between ports when arp is not involved.

Any insight?

Thanks

Brendan

[Цветков Андрей]

hi
trex version ? I see it  in 3.6

вторник, 15 сентября 2026 г. в 23:12:30 UTC+3, brendana...@gmail.com:

[opiekelly]

I am using 3.8.

On Sep 17, 2026, at 16:04, Цветков Андрей <after...@gmail.com> wrote:

hi

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[Цветков Андрей]

Trex in stl mode do not send arp response when traffic send - only in service. try bind ip-mac on dut
Trex in astf mode send arp response when traffic send.

пятница, 18 сентября 2026 г. в 03:11:23 UTC+3, opiekelly:

[brendana...@gmail.com]

This is what I see.

DUT switch sees the ARP entries.  However the ARP reply seems to be dropped by trex.

bkelly@sw1> show arp | match xe
3c:fd:fe:a4:cd:10 10.0.102.2      10.0.102.2                irb.102 [xe-0/2/0.0]    none
3c:fd:fe:a4:cd:11 10.0.103.2      10.0.103.2                irb.103 [xe-0/2/1.0]    none

bkelly@trex1:/opt/trex/v3.08$ sudo ./t-rex-64 -i --astf

trex>portattr
Port Status

     port       |          0           |          1
----------------+----------------------+---------------------
driver          |       net_i40e       |       net_i40e
description     |  Ethernet Controlle  |  Ethernet Controlle
link status     |          UP          |          UP
link speed      |       10 Gb/s        |       10 Gb/s
port status     |         IDLE         |         IDLE
promiscuous     |         off          |         off
multicast       |         off          |         off
flow ctrl       |         none         |         none
vxlan fs        |          -           |          -
--              |                      |
layer mode      |         IPv4         |         IPv4
src IPv4        |      10.0.102.2      |      10.0.103.2
IPv6            |         off          |         off
src MAC         |  3c:fd:fe:a4:cd:10   |  3c:fd:fe:a4:cd:11
---             |                      |
Destination     |      10.0.102.1      |      10.0.103.1
ARP Resolution  |      unresolved      |      unresolved
----            |                      |
VLAN            |         102          |         103
-----           |                      |
PCI Address     |     0000:01:00.0     |     0000:02:00.0
NUMA Node       |          -1          |          -1
RX Filter Mode  |    hardware match    |    hardware match
RX Queueing     |         off          |         off
Grat ARP        |         off          |         off
------          |                      |

bkelly@trex1:~$ cat /etc/trex_cfg.yaml
### Config file generated by dpdk_setup_ports.py ###

- version: 2
  interfaces: ['01:00.0', '02:00.0']
  port_info:
      - ip: 10.0.102.2
        default_gw: 10.0.102.1
        vlan: 102
      - ip: 10.0.103.2
        default_gw: 10.0.103.1
        vlan: 103

  platform:
      master_thread_id: 0
      latency_thread_id: 1
      dual_if:
        - socket: 0
          threads: [2,3,4,5,6,7]