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[Summary]
internal server error returned when set gateway of router with an octal ip address

[Topo]
devstack all-in-one node

[Description and expect result]
no error returned when set gateway of router with an octal ip address

[Reproduceable or not]
reproduceable 

[Recreate Steps]
1) create a router:
root@45-59:/opt/stack/devstack# neutron router-create router100
Created a new router:
+-------------------------+--------------------------------------+
| Field                   | Value                                |
+-------------------------+--------------------------------------+
| admin_state_up          | True                                 |
| availability_zone_hints |                                      |
| availability_zones      |                                      |
| distributed             | False                                |
| external_gateway_info   |                                      |
| ha                      | False                                |
| id                      | ab35ac7b-dc5f-4ec4-b3a3-26f90ecd9fd7 |
| name                    | router100                            |
| routes                  |                                      |
| status                  | ACTIVE                               |
| tenant_id               | 72a70635fa0c42a2bcba67edd760d516     |
+-------------------------+--------------------------------------+

2)internal server error returned when set gateway of router
 with an octal ip address:
root@45-59:/opt/stack/devstack# neutron router-gateway-set --fixed-ip subnet_id=
015bc64c-ab58-41a1-a296-b58198cffacc,ip_address=172.168.0.011 router100 ext-net
Request Failed: internal server error while processing your request.   >>>>ISSUE
root@45-59:/opt/stack/devstack# 

Note: the ip address 172.168.0.011 may be interpreted as octal address since
 there is a leading "0" in the address

3) if there is no leading "0" in the address, it's ok:
root@45-59:/opt/stack/devstack# 
root@45-59:/opt/stack/devstack# neutron router-gateway-set --fixed-ip 
subnet_id=015bc64c-ab58-41a1-a296-b58198cffacc,ip_address=172.168.0.11 router100 ext-net
Set gateway for router router100
root@45-59:/opt/stack/devstack# neutron router-show router100
+-------------------------+-------------------------------------------------------------------------------
--------------------------------------------------------------------------------
| Field                   | Value                                                                                                                             

                                                       |
+-------------------------+-------------------------------------------------------------------------------
--------------------------------------------------------------------------------
| admin_state_up          | True                                                                                                                              

                                                       |
| availability_zone_hints |                                                                                                                                   

                                                       |
| availability_zones      | nova                                                                                                                              

                                                       |
| distributed             | False                                                                                                                             

                                                       |
| external_gateway_info   | {"network_id": "1fd330fa-e2f3-40a0-b6fc-5c1caa4981c8"
, "enable_snat": true, "external_fixed_ips": [{"subnet_id": "015bc64c-ab58-41a1
-a296-b58198cffacc", "ip_address": "172.168.0.11"}]} |
| ha                      | False                                                                                                                             

                                                       |
| id                      | ab35ac7b-dc5f-4ec4-b3a3-26f90ecd9fd7                                                                                              

                                                       |
| name                    | router100                                                                                                                         

                                                       |
| routes                  |                                                                                                                                   

                                                       |
| status                  | ACTIVE                                                                                                                            

                                                       |
| tenant_id               | 72a70635fa0c42a2bcba67edd760d516                                                                                                  

                                                       |
+-------------------------+-------------------------------------------------------------------------------
-----------------------------------------------------------------------------

[Configration]
reproduceable bug, no need

[logs]
reproduceable bug, no need

[Root cause anlyze or debug inf]
reproduceable bug

[Attachment]
None

** Affects: neutron
     Importance: Undecided
     Assignee: Jas (singhj)
         Status: New

-- 
internal server error returned when set gateway of router with an octal ip address
https://bugs.launchpad.net/bugs/1531363
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