Forum Discussion
Port Lock down | Impact
- Mar 25, 2021
Hi,
1) If i ll allow default , then what all ports will be allowed
https://support.f5.com/csp/article/K17333
2) If i ll use custom, then what all port should i allow
Only those needed for your scenario. If you don't have gtm and you don't administer through self IP then udp/1026 but only if you are using that self IP for the cluster.
3) I can for logging into GUI , CLI we are using management IP . So I consider that administration is not manage by Self IP.
Sounds right.
4) Please let me know how i ll identity whether Self IP is being used for cluster communication or not.
From Device Management > Devices, open the BIG-IP you are logged in (self), then from the "Device connectivity" drop down menu check the settings of the different entries to know which IPs are used.
Setting port lockdown to none for Self IPs that are used for HA will break the cluster. However 'allow all' is very permissive and for most of the case it's not needed, you can either use 'default' or 'custom' with udp/1026.
Other things that may break is administration through ports 443 and 22 if you are administering BIG-IP through its self IP directly which is not recommended too.
If your Self IPs are not used for cluster communication or for administering BIG-IP, then using 'none' is generally the way to go
Hi Amine,
Thank you very much for your time and reply.
So please help me to understand below
1) If i ll allow default , then what all ports will be allowed
2) If i ll use custom, then what all port should i allow
3) I can for logging into GUI , CLI we are using management IP . So I consider that administration is not manage by Self IP.
4) Please let me know how i ll identity whether Self IP is being used for cluster communication or not.
Regards,
RAQS
- Amine_KadimiMar 25, 2021MVP
Hi,
1) If i ll allow default , then what all ports will be allowed
https://support.f5.com/csp/article/K17333
2) If i ll use custom, then what all port should i allow
Only those needed for your scenario. If you don't have gtm and you don't administer through self IP then udp/1026 but only if you are using that self IP for the cluster.
3) I can for logging into GUI , CLI we are using management IP . So I consider that administration is not manage by Self IP.
Sounds right.
4) Please let me know how i ll identity whether Self IP is being used for cluster communication or not.
From Device Management > Devices, open the BIG-IP you are logged in (self), then from the "Device connectivity" drop down menu check the settings of the different entries to know which IPs are used.
- RAQSMar 27, 2021Cirrus
Thanks Amine. I really appreciate your way to make me things understand. So in order to conclude.. I have to go to Select port lockdown as None. And in doing so i have to check whether self ip is a part of cluster communication and administration purpose or not. I checked its a not part of administrative purpose. But for cluster as you suggested i went to the path and saw self ip configured there. So this will break HA. Any way to avoid this ?
- Amine_KadimiMar 29, 2021MVP
Hi,
Yes, if you set port lockdown to 'None' in a self IP used for cluster you'll break HA. In this case, you have to either select 'Default' or 'Custom' and allow udp/1026.
BTW, if you have the possibility and have free physical interfaces, you may consider connecting the two nodes with a direct connection and use it exclusively for HA,
Recent Discussions
Related Content
* Getting Started on DevCentral
* Community Guidelines
* Community Terms of Use / EULA
* Community Ranking Explained
* Community Resources
* Contact the DevCentral Team
* Update MFA on account.f5.com