Server with 400 sites, all visitor have same IP (my server IP)

hi support,

I have pig problem here
I tried to install nginx admin manytimes
but NO Luck

all my websites (400 website), all visitors in that websites have my
dedicated IP address

that make all members have login problem in there forum coz the same IP
dedection

some information for that same IP
when run

netstat -plan|grep :80|awk {‘print $5’}|cut -d: -f 1|sort|uniq -c|sort

-nk 1

 15 41.238.235.138
 16 41.254.2.253
 18 197.122.191.18
 18 41.191.61.76
 20 41.35.96.40
 21 41.237.206.115
 34 217.55.196.72
 40 188.48.101.225
140 188.48.49.204

1556 xx.xx.xx.xx (my main server dedicated ip address)

nginx.conf

user nobody;

no need for more workers in the proxy mode

worker_processes 2;
error_log /var/log/nginx/error.log info;
worker_rlimit_nofile 20480;
events {
worker_connections 5120; # increase for busier servers
use epoll; # you should use epoll here for Linux kernels 2.6.x
}
http {
server_name_in_redirect off;
server_names_hash_max_size 10240;
server_names_hash_bucket_size 1024;
include mime.types;
default_type application/octet-stream;
server_tokens off;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 5;
gzip on;
gzip_vary on;
gzip_disable “MSIE [1-6].”;
gzip_proxied any;
gzip_http_version 1.1;
gzip_min_length 1000;
gzip_comp_level 6;
gzip_buffers 16 8k;

You can remove image/png image/x-icon image/gif image/jpeg if you have

slow CPU
gzip_types text/plain text/xml text/css application/x-javascript
application/xml image/png image/x-icon image/gif image/jpeg
application/xml+rss text/javascript application/atom+xml;
ignore_invalid_headers on;
client_header_timeout 3m;
client_body_timeout 3m;
send_timeout 3m;
reset_timedout_connection on;
connection_pool_size 256;
client_header_buffer_size 256k;
large_client_header_buffers 4 256k;
client_max_body_size 200M;
client_body_buffer_size 128k;
request_pool_size 32k;
output_buffers 4 32k;
postpone_output 1460;
proxy_temp_path /tmp/nginx_proxy/;
client_body_in_file_only on;
log_format bytes_log “$msec $bytes_sent .”;
include “/etc/nginx/vhosts/*”;
}

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