root@node3:~# host autodiscover.dom.ru
autodiscover.DOM.ru has address 188.186.146.37
root@node3:~# ip r get 188.186.146.37
188.186.146.37 via 100.100.1.1 dev eth0 src 5.181.109.174 uid 0
cache
root@node3:~# host owa.dom.ru
owa.DOM.ru has address 188.186.157.51
root@node3:~# ip r get 188.186.157.51
188.186.157.51 via 100.100.1.1 dev eth0 src 5.181.109.174 uid 0
cache
<?php
session_start([ 'cookie_domain' => 'test.lan', ]);
if (!isset($_SESSION['key'])) {
$_SESSION['key'] = 'value';
var_dump('set');
}
var_dump($_SESSION);
127.0.0.1 sub.test.lan test.lan
в /etc/hosts вполне себе работают
а в header.php