We've added 2000+ ip prefixes in a file "geo.conf" included in nginx vhost
by using ngx-http_geo_module and received the following warning :-

2014/06/19 23:52:46 [warn] 1633#0: duplicate network "103.24.96.0/22",
value: "tw", old value: "tw" in /usr/local/nginx/conf/geo.conf:40
2014/06/19 23:52:46 [warn] 1633#0: duplicate network "103.251.176.0/22",
value: "tw", old value: "tw" in /usr/local/nginx/conf/geo.conf:50
2014/06/19 23:52:46 [warn] 1633#0: duplicate network "202.141.224.0/19",
value: "tw", old value: "tw" in /usr/local/nginx/conf/geo.conf:1312
2014/06/19 23:52:46 [warn] 1633#0: duplicate network "202.142.160.0/19",
value: "tw", old value: "tw" in /usr/local/nginx/conf/geo.conf:1355
2014/06/19 23:52:46 [warn] 1633#0: duplicate network "202.5.136.0/21",
value: "tw", old value: "tw" in /usr/local/nginx/conf/geo.conf:1528

Due to it, nginx showing 504 gateway error for all ips included in geo.conf
file
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