netperf sends traffic with an address different from the one specified by the parameter "-L" on linux

[O-ring]

Hello everyone,

I have compiled netperf-master on Slackware linux x86-64, with the following options:

sh configure --prefix=/usr --enable-demo --enable-histogram

If I run the following command:

netperf -L 1.1.1.1 -H 10.81.160.56 -d 10 -l 5 -v 2 -D 1 -f m

I can see on the remote host (10.81.160.56) that the tcp traffic source ip address is not the one specified with the '-L' parameters, but another ip address (host is multi homed).
Here is the output from netperf:

netperf -L 1.1.1.1 -H 10.81.160.56 -d 10 -l 5 -v 2 -D 1 -f m
resolve_host called with host '10.81.160.56' port '(null)' family AF_UNSPEC
getaddrinfo returned the following for host '10.81.160.56' port '(null)' family AF_UNSPEC
cannonical name: '10.81.160.56'
flags: 22 family: AF_INET: socktype: SOCK_STREAM protocol IPPROTO_TCP addrlen 16
sa_family: AF_INET sadata: 0 0 10 81 160 56 0 0 0 0 0 0 0 0 0 0
scan_omni_args called with the following argument vector
netperf -L 1.1.1.1 -H 10.81.160.56 -d -l 5 -v 2 -D 1 -f m 10
sizeof(omni_request_struct)=200/648
sizeof(omni_response_struct)=204/648
sizeof(omni_results_struct)=284/648
Program name: netperf
Local send alignment: 8
Local recv alignment: 8
Remote send alignment: 8
Remote recv alignment: 8
Local socket priority: -1
Remote socket priority: -1
Local socket TOS: cs0
Remote socket TOS: cs0
Report local CPU 0
Report remote CPU 0
Verbosity: 2
Debug: 1
Port: 12865
Test name: TCP_STREAM
Test bytes: 0 Test time: 5 Test trans: 0
Host name: 10.81.160.56

installing catcher for all signals
Could not install signal catcher for sig 32, errno 22
Could not install signal catcher for sig 33, errno 22
Could not install signal catcher for sig 65, errno 22
remotehost is 10.81.160.56 and port 12865
resolve_host called with host '10.81.160.56' port '12865' family AF_INET
getaddrinfo returned the following for host '10.81.160.56' port '12865' family AF_INET
cannonical name: '10.81.160.56'
flags: 22 family: AF_INET: socktype: SOCK_STREAM protocol IPPROTO_TCP addrlen 16
sa_family: AF_INET sadata: 50 65 10 81 160 56 0 0 0 0 0 0 0 0 0 0
resolve_host called with host '1.1.1.1' port '0' family AF_UNSPEC
getaddrinfo returned the following for host '1.1.1.1' port '0' family AF_UNSPEC
cannonical name: '1.1.1.1'
flags: 22 family: AF_INET: socktype: SOCK_STREAM protocol IPPROTO_TCP addrlen 16
sa_family: AF_INET sadata: 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0
establish_control called with host '10.81.160.56' port '12865' remfam AF_INET
local '1.1.1.1' port '0' locfam AF_UNSPEC
bound control socket to 1.1.1.1 and 0
successful connection to remote netserver at 10.81.160.56 and 12865
complete_addrinfo using hostname 10.81.160.56 port 0 family AF_INET type SOCK_STREAM prot IPPROTO_TCP flags 0x0
getaddrinfo returned the following for host '10.81.160.56' port '0' family AF_INET
cannonical name: '10.81.160.56'
flags: 22 family: AF_INET: socktype: SOCK_STREAM protocol IPPROTO_TCP addrlen 16
sa_family: AF_INET sadata: 0 0 10 81 160 56 0 0 0 0 0 0 0 0 0 0
local_data_address not set, using local_host_name of '1.1.1.1'
complete_addrinfo using hostname 1.1.1.1 port 0 family AF_UNSPEC type SOCK_STREAM prot IPPROTO_TCP flags 0x1
getaddrinfo returned the following for host '1.1.1.1' port '0' family AF_UNSPEC
cannonical name: '1.1.1.1'
flags: 23 family: AF_INET: socktype: SOCK_STREAM protocol IPPROTO_TCP addrlen 16
sa_family: AF_INET sadata: 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0
MIGRATED TCP STREAM TEST from 1.1.1.1 () port 0 AF_INET to 10.81.160.56 () port 0 AF_INET : histogram : demo
create_data_socket: socket 4 obtained...
netperf: get_sock_buffer: send socket size determined to be 131072
netperf: get_sock_buffer: receive socket size determined to be 131072
send_omni_inner: 2 entry send_ring obtained...
recv_response: received a 656 byte response
remote listen done.
remote port is 40275
About to start a timer for 5 seconds.
Interim result: 77.22 10^6bits/s over 1.032 seconds ending at 1611671064.064
Interim result: 74.05 10^6bits/s over 1.062 seconds ending at 1611671065.126
Interim result: 72.41 10^6bits/s over 1.014 seconds ending at 1611671066.139
Interim result: 71.36 10^6bits/s over 1.014 seconds ending at 1611671067.153
Interim result: 74.00 10^6bits/s over 0.879 seconds ending at 1611671068.032
netperf: get_sock_buffer: receive socket size determined to be 131072
netperf: get_sock_buffer: send socket size determined to be 1912320
disconnect_data_socket sock 4 init 1 do_close 1 protocol 6
Adjusting elapsed_time by 0 seconds
recv_response: received a 656 byte response
remote results obtained
calculate_confidence: itr 1; time 5.197987; res 71.192497
lcpu -1.000000; rcpu -1.000000
lsdm -1.000000; rsdm -1.000000
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

131072 131072 131072 5.20 71.19

Alignment Offset Bytes Bytes Sends Bytes Recvs
Local Remote Local Remote Xfered Per Per
Send Recv Send Recv Send (avg) Recv (avg)
8 8 0 0 46137344 131072.00 352 1404.02 32861

Maximum
Segment
Size (bytes)
1349

Histogram of time spent in send() call.
UNIT_USEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
TEN_USEC : 0: 0: 216: 44: 3: 3: 2: 1: 0: 0
HUNDRED_USEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
UNIT_MSEC : 0: 0: 1: 0: 0: 0: 1: 0: 1: 0
TEN_MSEC : 0: 1: 7: 8: 3: 5: 2: 53: 0: 0
HUNDRED_MSEC : 0: 1: 0: 0: 0: 0: 0: 0: 0: 0
UNIT_SEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
TEN_SEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0

100_SECS: 0
HIST_TOTAL: 352
sum 4990327, sumsquare 0.000000, limit 2 count 1
shutdown_control: shutdown of control connection requested.

and this is the "ip a li" output from the netperf box:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether fc:4d:d4:2e:dd:59 brd ff:ff:ff:ff:ff:ff
inet 10.68.64.254/22 brd 10.68.67.255 scope global eth0
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 00:1f:29:54:ac:0c brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:1f:29:54:ac:0d brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 00:15:17:f9:54:0f brd ff:ff:ff:ff:ff:ff
inet 1.1.1.1/28 scope global eth3
valid_lft forever preferred_lft forever
6: eth4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether a0:ce:c8:13:1e:f2 brd ff:ff:ff:ff:ff:ff

ip source address is always the 10.68.64.254 even though the '-L' parameter has been specified

[bkiziuk]

Hmm, the help says that -L causes to bind (only) a control connection to a specific interface which seems to work.
However, I would also like to see an ability to bind the data connection to a specific interface.
It is useful in setups where there's a need to create multiple independent test streams via different physical interfaces.

[O-ring]

Hello,

yes indeed. I also try to dig inside the sources, but no luck.