ASTF server missing VLAN tags

[Natarajan M]

Hi,

I'm running ASTF in split mode (astf-client on server-A & astf-sever on server-B) with Mellanox connectx-5 NIC & linux.

Client starts traffic with VLAN tag as per trex_cfg.yaml, but server doesnt include any VLAN tag while sending back (Thought in ASTF mode, server learns VLAN from incoming packet although I also had vlan in /etc/trex_cfg.yaml. Any help to work-around to make sure that server can also respond with VLAN tag will be of great help. Appreciate any pointers.

SYN

###[ Ethernet ]### 

  dst= 00:00:00:40:08:02

  src= 00:00:00:40:08:01

  type= 0x8100

###[ 802.1Q ]### 

     prio= 0L

     id= 0L

     vlan= 1L

     type= 0x800

###[ IP ]### 

        version= 4L

        ihl= 5L

        tos= 0x0

        len= 60

        id= 0

        flags= DF

        frag= 0L

        ttl= 127

        proto= tcp

        chksum= 0xf79a

        src= 2.0.0.1

        dst= 2.0.0.33

        \options\

###[ TCP ]### 

           sport= 41668

           dport= http

           seq= 846930886

           ack= 0

           dataofs= 10L

           reserved= 0L

           flags= S

           window= 32768

           chksum= 0x0

           urgptr= 0

           options= [('MSS', 1460), ('NOP', None), ('WScale', 0), ('NOP', None), ('NOP', None), ('Timestamp', (1804289383, 0))]

SYN/ACK response from server

###[ Ethernet ]### 

  dst= 00:00:00:40:08:01

  src= 00:00:00:40:08:02

  type= 0x800

###[ IP ]### 

     version= 4L

     ihl= 5L

     tos= 0x0

     len= 60

     id= 0

     flags= DF

     frag= 0L

     ttl= 127

     proto= tcp

     chksum= 0xf79a

     src= 2.0.0.33

     dst= 2.0.0.1

     \options\

###[ TCP ]### 

        sport= http

        dport= 41668

        seq= 1804116595

        ack= 846930887

        dataofs= 10L

        reserved= 0L

        flags= SA

        window= 32768

        chksum= 0x0

        urgptr= 0

        options= [('MSS', 1460), ('NOP', None), ('WScale', 0), ('NOP', None), ('NOP', None), ('Timestamp', (1681693964, 1804289383))]

Thanks

Natarajan

[hanoh haim]

https://github.com/cisco-system-traffic-generator/trex-core/blob/81e3714985931166bc9e7142c2db9a08236bbf87/src/44bsd/flow_table.cpp#L694

The code shows that the server will respond with the same vlan of the SYN.

Did you capture both on the server side using TRex?

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[hanoh haim]

testing it with our setup 

$more /etc/trex_cfg_vlan.yaml
### Config file generated by dpdk_setup_ports.py ###

- port_limit: 2
  version: 2
  interfaces: ['04:00.0', '04:00.1']
  port_info:
      - ip: 1.1.1.1
        default_gw: 2.2.2.2
        vlan: 1
      - ip: 2.2.2.2
        default_gw: 1.1.1.1
        vlan: 1

  platform:
      master_thread_id: 0
      latency_thread_id: 14
      dual_if:
        - socket: 0
          threads: [1,2,3,4,5,6,7,8,9,10,11,12,13]

trex>capture record start --tx 1 --rx 1 -l 1000

trex>capture record stop --id 1 -o /tmp/out.pcap

shows that the pcap is with VLAN (the server does not require  the valn configuration) 

[Natarajan M]

Thanks. Yes, when I move to dpdk mode, it worked fine but if I use linux interface mode instead of DPDK, it doesnt work.

Thanks

Natarajan

[opiekelly]

Hello, I am running a SDWAN test and need to bring down the MTU.  However when I look at the capture on the wire from the trex port I see full 1460 mss.

Below are the configurations.

root@ansible-/home/bkelly/trex/v2.56#cat astf/vip1.py

from trex.astf.api import *

class Prof1():

    def __init__(self):

        pass

    def get_profile(self, **kwargs):

        ip_gen_c = ASTFIPGenDist(ip_range=["16.0.0.1", "16.0.0.255"], distribution="seq")

        ip_gen_s = ASTFIPGenDist(ip_range=["48.0.0.1", "48.0.0.255"], distribution="seq")

        ip_gen = ASTFIPGen(dist_client=ip_gen_c, dist_server=ip_gen_s)

        c_glob_info = ASTFGlobalInfo()

        c_glob_info.tcp.mss = 1300

        c_glob_info.tcp.initwnd = 1

        s_glob_info = ASTFGlobalInfo()

        s_glob_info.tcp.mss = 1300

        s_glob_info.tcp.initwnd = 1

        return ASTFProfile(default_ip_gen=ip_gen, cap_list=[

          ASTFCapInfo(file="../avl/delay_10_http_browsing_0.pcap", cps=1)

        ])

def register():

    return Prof1()

[root@trex astf]# cat /etc/trex_cfg.yaml

- port_limit      : 2

  version         : 2

  prefix          : trex-1

  limit_memory    : 2048

#List of interfaces. Change to suit your setup. Use ./dpdk_setup_ports.py -s to see available options

  interfaces    : ["81:00.2","81:00.3"]

  stack: linux_based

  port_info       :  # Port IPs. Change to suit your needs. In case of loopback, you can leave as is.

          - ip         : 4.4.0.2

            default_gw : 4.4.0.254

            #dest_mac : 3c:fd:fe:a4:ca:2b

            vlan       : 104

          - ip         : 12.12.0.2

            default_gw : 12.12.0.254

            #dest_mac  : 3c:fd:fe:a4:ca:2a

            vlan       : 112

[opiekelly]

Disregard, noticed my “return” section was incorrect.

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