Hello,
I have a following simple network topology consisting of two laptops
and one L2 switch facing with trunk ports to laptops:
T60[eth0] <-> switch <-> [eth0]T42
Both T60 and T42 machines have three sub-interfaces:
T60:~ # ip addr show | grep "eth0.[0-9]*$"
inet 10.10.1.1/24 brd 10.10.1.255 scope global eth0.534
inet 10.10.2.1/24 brd 10.10.2.255 scope global eth0.541
inet 10.10.3.1/24 brd 10.10.3.255 scope global eth0.653
T60:~ #
T42 ~ # ip addr show | grep "eth0.[0-9]*$"
inet 10.10.1.2/24 brd 10.10.1.255 scope global eth0.534
inet 10.10.2.2/24 brd 10.10.2.255 scope global eth0.541
inet 10.10.3.2/24 brd 10.10.3.255 scope global eth0.653
T42 ~ #
..and L3 connectivity between laptops works fine:
T60:~ # ping -I 10.10.1.1 -qc10 10.10.1.2
PING 10.10.1.2 (10.10.1.2) from 10.10.1.1 : 56(84) bytes of data.
--- 10.10.1.2 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 8999ms
rtt min/avg/max/mdev = 0.271/0.349/0.436/0.047 ms
T60:~ # ping -I 10.10.2.1 -qc10 10.10.2.2
PING 10.10.2.2 (10.10.2.2) from 10.10.2.1 : 56(84) bytes of data.
--- 10.10.2.2 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 8999ms
rtt min/avg/max/mdev = 0.250/0.349/0.427/0.048 ms
T60:~ # ping -I 10.10.3.1 -qc10 10.10.3.2
PING 10.10.3.2 (10.10.3.2) from 10.10.3.1 : 56(84) bytes of data.
--- 10.10.3.2 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 8997ms
rtt min/avg/max/mdev = 0.271/0.359/0.404/0.043 ms
T60:~ #
Both T60 and T42 have firewall disabled.
I started three Iperf server processes in T60 with "iperf -s -u -fm -B
10.10.1.1 -p 5001", "iperf -s -u -fm -B 10.10.2.1 -p 5002" and "iperf
-s -u -fm -B 10.10.3.1 -p 5003" commands:
Proto Recv-Q Send-Q Local Address Foreign Address
State PID/Program name
udp 0 0 10.10.1.1:5001 0.0.0.0:*
6026/iperf
udp 0 0 10.10.2.1:5002 0.0.0.0:*
5867/iperf
udp 0 0 10.10.3.1:5003 0.0.0.0:*
5870/iperf
Now if I start Iperf clients in T42 machine with "iperf -c 10.10.1.1
-fm -t20 -u -b 20m -p 5001", "iperf -c 10.10.2.1 -u -d -fm -t 120 -p
5002" and "iperf -c 10.10.3.1 -u -d -fm -t 120 -p 5003" commands, the
server processes do not indicate that there has been a connection from
Iperf client. Iperf clients just indicate that there was no ack
received of the last datagram:
[ 3] Sent 34015 datagrams
[ 3] WARNING: did not receive ack of last datagram after 10 tries.
For example if I execute "nmap -PN -sU -p 5001 --reason 10.10.1.1" in
T42 I can see that Iperf server with PID 6026("iperf -s -u -fm -B
10.10.1.1 -p 5001") receives a connection. In addition, if I run
"tcpdump -ni eth0.534 udp and port 5001" in T60 machine and execute
"iperf -c 10.10.1.1 -fm -d -t20 -u -b 20m -p 5001", then I capture
nothing with tcpdump.
Iperf version both in T42 and T60 is 2.0.5. Any ideas what might cause
such behavior? In case additional information is needed, please ask.
regards,
Martin
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