dhcpd несколько серверов доменных имен
Я делаю это в sendmail путем конфигурирования нескольких доменов, которые будут обработаны реле.
Править
/etc/mail/local-hosts-names
и добавьте домены, которые Вы хотите обработать. Например:
# local-host-names - include all aliases for your machine here.
domain.com
otherdomain.com
yetmore.net
После внесения Ваших изменений и предположения DNS установка правильно, перезапуск sendmail.
Примечание: это означает, что user@domain эквивалентен user@otherdomain, потому что /etc/passwd и /etc/aliases поражен для обоих для пользовательской проверки.
The spec for option type 6 has variable length and can support more than two entries. The length field is 8 bits and represents the number of bytes. 256 / 4 = 64 IP's. Clearly this is well beyond the number that the client must recognize, but specifying 3 entries is likely supported by many clients. It certainly won't hurt anything. orst-case the client will ignore the third.
Whether it makes sense or not is a function of your own infrastructure and availability. A WAN site might have two redundant servers on site and a third remote, for example. There are a number of mechanisms to improve availability of DNS infrastructure, many of which don't require additional IP's to be configured on the client side (i.e. anycast, load balancers).
you can put in as many as you want. 2 is common, 3 is not unreasonable and also somewhat common. 4+ would be edging in to overkill.