Use nc (netcat) to test for network issues to specified IP and port (TCP or UDP).
Dynamically determines source IP to use based on destination IP from available route.
Default uses TCP protocol. You can specify protocol: udp if UDP is needed for test.
- Ubuntu 18.04 / 16.04
- CentOS / RHEL: 7.x, 6.5, 5.9
OS commands:
- nc (netcat) - will be installed if not present
- ip
- awk
- Enable debug
debug_enabled_default: false- Timeout
connectivity_test_wait_default: 5- UDP argument to use if 'udp' specified in config
connectivity_test_udp_command: "-u"- Proxy
proxy_env: []TCP protocol used by default (doesn't need to be specified).
---
connectivity_test_destinations:
- { ip: 192.168.56.10, port: 22 }
- { ip: 192.168.56.10, port: 5000 }
- { ip: 127.0.0.1, port: 53, protocol: udp }---
- hosts: '{{inventory}}'
become: yes
roles:
- connectivity-testansible-playbook connectivity-test.yml --extra-vars "inventory=all-dev" -i hostsSkip installing packages (if known already there - speeds up task)
ansible-playbook connectivity-test.yml --extra-vars "inventory=all-dev" -i hosts --skip-tags connectivity_install_pkgTASK [setup] *******************************************************************
ok: [centos7]
TASK [connectivity-test : Install dependant packages in RedHat based machines] *
ok: [centos7] => (item=[u'nc'])
TASK [connectivity-test : Get source IP based on destination IP] ***************
ok: [centos7] => (item=source ip: 127.0.0.1, destination ip: 127.0.0.1)
ok: [centos7] => (item=source ip: 127.0.0.1, destination ip: 127.0.0.1)
ok: [centos7] => (item=source ip: 192.168.56.9, destination ip: 192.168.56.10)
TASK [connectivity-test : debug] ***********************************************
TASK [connectivity-test : test network connectivity] ***************************
ok: [centos7] => (item=source ip: 192.168.56.9, destination ip: 192.168.56.10, port: 22, protocol: tcp, time: 2019-07-09 23:02:56.518272, stdout: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8, stderr: Connection to 192.168.56.10 22 port [tcp/ssh] succeeded!
)
ok: [centos7] => (item=source ip: 127.0.0.1, destination ip: 127.0.0.1, port: 53, protocol: udp, time: 2019-07-09 23:03:12.337049, stdout: , stderr: Connection to 127.0.0.1 53 port [udp/domain] succeeded!
)
failed: [centos7] (item=source ip: 192.168.56.9, destination ip: 192.168.56.10, port: 5000, protocol: tcp, time: 2019-07-09 23:03:33.893978, stdout: , stderr: nc: connect to 192.168.56.10 port 5000 (tcp) timed out: Operation now in progress
)
TASK [connectivity-test : debug] ***********************************************
PLAY RECAP *********************************************************************
centos7 : ok=3 changed=0 unreachable=0 failed=1
dIP="192.168.56.10 192.168.56.13";
dPORT="5000";
sIP=$(/sbin/ip route get "$(echo $dIP|awk -F" " 'NR==1{print $1}')"|awk 'NR==1{print $NF}');
uname -n;
echo "Src IP: $sIP";
for i in $dIP;
do date;
nc -v -w 3 -s "$sIP" "$i" "$dPORT";
echo " ";
done
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