ISR 4431 IOS XE - %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed

[g3doubt]

I have an ISR running 16.9.7 version  User are having some problems with zoom and  teams applications and I noticed the following logs on the router:

Sep 10 13:08:49: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:002 TS:00000138572425202079 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:13:14: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:002 TS:00000138839310112259 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:18:23: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:005 TS:00000139147625478907 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:19:39: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139225842515790 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:20:35: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139279121636138 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:20:53: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139298062021192 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:21:32: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139337738657947 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:22:09: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139376244344377 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:23:06: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139429556230188 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:24:02: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139488204543932 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:26:17: %SYS-6-LOGOUT: User aortega has exited tty session 866(10.79.15.20)
*Sep 10 13:29:12: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139795986324678 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:30:28: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:004 TS:00000139874195016766 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:31:25: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:002 TS:00000139931769778970 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:31:41: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139944666694173 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:32:21: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000139986091638890 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:32:58: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000140023321698118 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:33:54: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000140080459316447 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:34:50: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:002 TS:00000140134812340313 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]
*Sep 10 13:40:02: %IOSXE-6-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:001 TS:00000140449254404895 %NAT-6-ADDR_ALLOC_FAILURE: Address allocation failed; pool 1 may be exhausted [2]

cdj-gwwan01#show ip nat translations total
Total number of translations: 2886

cdj-gwwan01#show ip nat pool name CDJ

NAT Pool Statistics

Pool name CDJ, id 1
Assigned Available
Addresses 2 0
UDP Low Ports 0 1024
TCP Low Ports 0 1024
UDP High Ports 477 128547
TCP High Ports 2359 126665

(Low ports are less than 1024. High ports are greater than or equal to 1024.)cdj-gwwan01#show ip nat translations filter entry-type half all
Pro Inside global Inside local Outside local Outside global
--- 189.206.195.53 10.74.69.181 --- ---
Total number of translations: 1

NAT CONFIGURATION

ip nat translation timeout 300
ip nat translation tcp-timeout 600
ip nat translation udp-timeout 30
ip nat translation icmp-timeout 3
ip nat translation max-entries 2147483647
ip nat pool CDJ 189.206.195.53 189.206.195.54 netmask 255.255.255.252
ip nat inside source list NATCAMPUS pool CDJ overload

When I checked the Pool, it had capacity for more tranlations

Any help will be highly appreciated

[marce1000 · Accepted solution]

 - Check this  thread : 

           https://community.cisco.com/t5/network-management/asr1000-cisco-ios-xe-nat-6-addr-alloc-failure-address-allocation/td-p/4286860

 M.

[g3doubt]

Hi Marce,

The bug documentation seems to affect only ASR and doesn´t has a fixed release.

I will apply the command ip nat settings nonpatdrop, it seems to be final solution but I dónt know if the output  of show ip nat translations filter entry-type half all is enought evidence.

#show ip nat translations filter entry-type half all
Pro Inside global Inside local Outside local Outside global
--- 189.206.195.53 10.74.69.181 --- ---
Total number of translations: 1

I will keep updated if it works.

Regards

[rlall23]

Hi Gerardo,

Did the nonpatdrop setting fix your issue?

I'm having the same issue on my ISR running 15.5(3)S4b.

Thanks,

Richard

[g3doubt]

Hi,

ip nat settings nonpatdrop and clear ip nat translations * stoped the logg.

Regards