201 · Question #206
A BIG-IP Administrator finds the following log entry after a report of user issues connecting to a virtual server: 01010201: 2: Inet port exhaustion on 10.70.110.112 to 192.28.123.250:80 (proto 6) How
The correct answer is C. Add an address to the SNAT pool.. The log entry indicates 'Inet port exhaustion' for SNAT connections, meaning the BIG-IP is running out of available source ports for outbound connections to backend servers.
Question
A BIG-IP Administrator finds the following log entry after a report of user issues connecting to a virtual server:
01010201: 2: Inet port exhaustion on 10.70.110.112 to 192.28.123.250:80 (proto 6) How should the BIG-IP Administrator modify the SNAT pool that is associated with the virtual server?
Options
- ARemove the SNAT pool and apply SNAT Automap.
- BRemove an IP address from the SNAT pool.
- CAdd an address to the SNAT pool.
- DIncrease the timeout of the SNAT addresses.
How the community answered
(30 responses)- A10% (3)
- B3% (1)
- C83% (25)
- D3% (1)
Why each option
The log entry indicates 'Inet port exhaustion' for SNAT connections, meaning the BIG-IP is running out of available source ports for outbound connections to backend servers.
Removing the SNAT pool and applying SNAT Automap would likely use the self-IP, which could still experience port exhaustion if not configured with sufficient addresses.
Removing an IP address from the SNAT pool would reduce the total number of available source ports, exacerbating the port exhaustion issue.
Adding more IP addresses to the SNAT pool increases the total number of available source ports that the BIG-IP can use for SNAT connections. Each unique IP address provides a new set of approximately 64,000 source ports, directly alleviating port exhaustion.
Increasing the timeout of SNAT addresses would cause ports to remain occupied for longer, which could worsen port exhaustion rather than resolve it.
Concept tested: F5 BIG-IP SNAT port exhaustion resolution
Source: https://techdocs.f5.com/en-us/bigip-15-0-0/big-ip-local-traffic-manager-concepts/snat-automap-and-snat-pools.html
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