Awọn Igbasilẹ DNS Ti Ṣe Alaye: A, MX, CNAME, TXT ati Ju Bẹẹ Lọ
Itọsọna alaye ti awọn iru igbasilẹ DNS, awọn iṣẹ wọn, ati bi wọn ṣe ni ipa lori ifijiṣẹ imeeli ati wiwa rẹ lori ayelujara.
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DNS (Domain Name System) jẹ ipilẹ ti intanẹẹti. O tumọ awọn orukọ ibugbe ti eniyan le ranti si awọn adirẹsi IP ti awọn kọmputa lo. Oye awọn oriṣiriṣi iru igbasilẹ DNS ṣe pataki fun ẹnikẹni ti o n ṣakoso ibugbe tabi olupin imeeli.
Igbasilẹ A (Address)
Igbasilẹ A tọka orukọ ibugbe kan si adirẹsi IPv4. Eyi ni iru igbasilẹ DNS ti o rọrun julọ.
example.com. IN A 93.184.216.34
Igbasilẹ AAAA
Gẹgẹ bi igbasilẹ A, ṣugbọn fun awọn adirẹsi IPv6.
example.com. IN AAAA 2606:2800:220:1:248:1893:25c8:1946
Igbasilẹ MX (Mail Exchange)
Igbasilẹ MX ṣe apejuwe olupin imeeli ti o ni iduro fun gbigba imeeli fun ibugbe naa. Nọmba pataki pinnu olupin wo ni a yoo gbiyanju ni akọkọ.
example.com. IN MX 10 mx.evilmail.com.
example.com. IN MX 20 mx2.evilmail.com.
Igbasilẹ CNAME (Canonical Name)
Igbasilẹ CNAME ṣẹda orukọ miiran (alias) fun ibugbe miiran. A maa n lo nigbagbogbo fun awọn ibugbe kekere.
www.example.com. IN CNAME example.com.
Igbasilẹ TXT
Awọn igbasilẹ TXT mu ọrọ lainidii ati pe a lo fun awọn idi oriṣiriṣi, pẹlu ijẹrisi nini ibugbe, SPF, DKIM, ati DMARC.
SPF (Sender Policy Framework)
example.com. IN TXT "v=spf1 include:evilmail.com ~all"
DMARC
_dmarc.example.com. IN TXT "v=DMARC1; p=quarantine; rua=mailto:[email protected]"
Igbasilẹ NS (Name Server)
Igbasilẹ NS ṣe apejuwe awọn olupin orukọ ti o ni aṣẹ fun ibugbe naa.
example.com. IN NS ns1.example.com.
example.com. IN NS ns2.example.com.
Igbasilẹ SRV (Service)
Igbasilẹ SRV ṣe apejuwe ipo olupin fun awọn iṣẹ kan pato, bii SIP tabi XMPP.
TTL (Time to Live)
Igbasilẹ DNS kọọkan ni iye TTL ti o ṣe apejuwe akoko ti awọn olupin kaṣe DNS yẹ ki o tọju igbasilẹ naa ṣaaju ki o to beere lẹẹkansi. TTL aṣoju jẹ awọn iṣẹju-aaya 3600 (wakati 1).
DNS ati Imeeli
Fun ifijiṣẹ imeeli ti o tọ, o nilo o kere ju igbasilẹ MX kan. Fun aabo ti o ga julọ ati ifijiṣẹ ti o dara julọ, o tun nilo awọn igbasilẹ SPF, DKIM, ati DMARC. EvilMail ṣe iranlọwọ fun ọ lati ṣeto gbogbo awọn igbasilẹ wọnyi fun ibugbe aṣa rẹ.
