>> 4- так же как и пинг может ответить может нет
> в студию конфиг bind с этими записями

named.conf

// Boot file for Realist name server

acl "our_folks" {192.168.1.0/24; 82.115.38.250;};
options {
        directory "/var/named";
        listen-on { any; };
    allow-transfer { "none"; };
    allow-recursion {"our_folks";};
//    allow-query { any ; };
    version "unknown";
    listen-on-v6 { "none"; };
};

logging {
    channel default_ch {
    file "/var/log/nameg.log"';
    print-time yes;
    print-category yes;
};
    channel security_ch {
    file "/var/log/named_security.log";
    print-time yes;
    print-category yes;
};
category default { default_ch; };
category security { security_ch; };
category lame-servers {null;};
};

                              
zone "." {
    type hint;
    file "root.hints";
};

                                
zone "0.0.127.in-addr.arpa" {
    type master;
    file "127.0.0";
    allow-update {none;};
};

                                                                
zone "xxx.xx" {
        type master;
    file "xxx.xx";
    allow-transfer { "our_folks";};
};

                                                                                
zone "33.22.11.in-addr.arpa" {
        type master;
        file "33.22.11";
};

файл зоны

@       IN      SOA     ns.xxx.xx. postmaster.xxx.xx. (
                        2015121657       ; serial, todays date + todays serial #
                        900              ; refresh, seconds
                        600             ; retry, seconds
                        86400             ; expire, seconds
            3600 )            ; minimum, seconds
        NS    ns.xxx.xx.

        MX    10 mail  ; Primary Mail Exchanger
                

xxx.xx.            A    11.22.33.44
mail            A    11.22.33.44
ns            A    11.22.33.44
www            A    11.22.33.44