[srsran-users] ZMQ Address Already in Use Error

Fri Dec 31 17:18:53 UTC 2021

Hi again,

Here is an example when starting the enb first and no ue or epc started yet.

You can see here that the enb binds to port 2000 and tries to connect to 
the ue on port 2001 and the epc on port 36412

My guess is that you have a conflict with ports 200X.

Also using 127.0.0.1 is always preferred to using localhost since the 
later depends on your /etc/hosts and possibly resolve.conf.

Joe

$ strace -f -e trace=network ./srsenb ./enb.conf.zmq
Reading configuration file ./enb.conf.zmq...
---  Software Radio Systems LTE eNodeB  ---

Reading configuration file ./enb.conf.zmq...
strace: Process 1029173 attached
Failed to `mlockall`: {}
Built in Release mode using commit e335bb968 on branch faux_rf.

strace: Process 1029174 attached
strace: Process 1029175 attached
strace: Process 1029176 attached
[pid 1029172] socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP) = 6
[pid 1029172] setsockopt(6, SOL_SCTP, SCTP_EVENTS, 
"\1\0\1\0\0\1\0\0\0\0\0\0\0\0", 14) = 0
[pid 1029172] getsockopt(6, SOL_SCTP, SCTP_RTOINFO, 
"\0\0\0\0\270\v\0\0`\352\0\0\350\3\0\0", [16]) = 0
[pid 1029172] setsockopt(6, SOL_SCTP, SCTP_RTOINFO, 
"\0\0\0\0\270\v\0\0p\27\0\0\350\3\0\0", 16) = 0
[pid 1029172] getsockopt(6, SOL_SCTP, SCTP_INITMSG, 
"\n\0\377\377\10\0`\352", [8]) = 0
[pid 1029172] setsockopt(6, SOL_SCTP, SCTP_INITMSG, 
"\n\0\377\377\3\0\210\23", 8) = 0
[pid 1029172] bind(6, {sa_family=AF_INET, sin_port=htons(0), 
sin_addr=inet_addr("127.0.1.1")}, 16) = 0
[pid 1029172] connect(6, {sa_family=AF_INET, sin_port=htons(36412), 
sin_addr=inet_addr("127.0.1.100")}, 16) = -1 ECONNREFUSED (Connection 
refused)
connect(): Connection refused This is the enb attempting to connect ot 
the epc

Failed to initiate S1 connection. Attempting reconnection in 10 seconds
[pid 1029172] socket(AF_INET, SOCK_DGRAM, IPPROTO_IP) = 6
[pid 1029172] setsockopt(6, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
[pid 1029172] setsockopt(6, SOL_SOCKET, SO_REUSEPORT, [1], 4) = 0
[pid 1029172] bind(6, {sa_family=AF_INET, sin_port=htons(2152), 
sin_addr=inet_addr("127.0.1.1")}, 16) = 0
strace: Process 1029177 attached
Opening 1 channels in RF device=zmq with 
args=id=enb,tx_port0=tcp://*:2000,rx_port0=tcp://localhost:2001
Available RF device list: zmq  shmem
CHx id=enb
Current sample rate is 1.92 MHz with a base rate of 23.04 MHz (x12 
decimation)
CH0 rx_port=tcp://localhost:2001
CH0 tx_port=tcp://*:2000
strace: Process 1029178 attached
strace: Process 1029179 attached
[pid 1029172] socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 13
[pid 1029172] setsockopt(13, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
[pid 1029172] bind(13, {sa_family=AF_INET, sin_port=htons(2000), 
sin_addr=inet_addr("0.0.0.0")}, 16) = 0
[pid 1029172] listen(13, 100)           = 0
[pid 1029172] getsockname(13, {sa_family=AF_INET, sin_port=htons(2000), 
sin_addr=inet_addr("0.0.0.0")}, [128 => 16]) = 0
[pid 1029172] getsockname(13, {sa_family=AF_INET, sin_port=htons(2000), 
sin_addr=inet_addr("0.0.0.0")}, [128 => 16]) = 0
[pid 1029179] socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) 
= 15
[pid 1029179] connect(15, {sa_family=AF_UNIX, 
sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or 
directory)
[pid 1029179] socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) 
= 15
[pid 1029179] connect(15, {sa_family=AF_UNIX, 
sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or 
directory)
[pid 1029179] socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 15
[pid 1029179] connect(15, {sa_family=AF_INET, sin_port=htons(2001), 
sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in 
progress)
strace: Process 1029180 attached
[pid 1029179] getsockopt(15, SOL_SOCKET, SO_ERROR, [ECONNREFUSED], [4]) = 0
[pid 1029179] socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 15
[pid 1029179] connect(15, {sa_family=AF_INET, sin_port=htons(2001), 
sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in 
progress)
[pid 1029179] getsockopt(15, SOL_SOCKET, SO_ERROR, [ECONNREFUSED], [4]) = 0
[pid 1029179] socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 15
[pid 1029179] connect(15, {sa_family=AF_INET, sin_port=htons(2001), 
sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in 
progress)

On 12/30/21 22:05, Dan Dole-Muinos wrote:
>
> Hello,
>
> I have been following this 
> <https://docs.srsran.com/en/latest/app_notes/source/zeromq/source/index.html> guide, 
> attempting to get ZMQ virtual radios working within GNU Radio (as is 
> described in the last section on that guide).
>
> It seems as though when I specify the ports used for the UE and eNB in 
> the ZMQ sources/sinks in GR, I get an "address already used" error 
> message. If I try running the flowchart first, I see the same message 
> in the console output of the UE and eNB. I have ensured ZMQ is indeed 
> installed and seen by the srsRAN cmake file, and have reinstalled both 
> and tried the ZMQ on GR steps after a reboot. What am I missing?
>
> GR ZMQ also throws a "no such device" error when setting the address 
> as localhost, instead, I needed to use 127.0.0.1 as the IP in order to 
> progress. I am using GR 3.8.3.1, and the latest srsRAN version 21.10.0.
>
> Thanks,
> Dan
>
>
> _______________________________________________
> srsran-users mailing list
> srsran-users at lists.srsran.com
> https://lists.srsran.com/mailman/listinfo/srsran-users

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