Dotaz: BIND a caching DNS + DNS pro lokalni podsite...

[jm]

Zdravim. Mam tu router se tremi sitovymi kartami.

eth0 --> firewall --> inet (192.168.0.0/255.255.255.0)

eth1 --> subnet1 (192.168.1.0/255.255.255.0)

eth2 --> subnet2 (192.168.2.0/255.255.255.0)

Jako DNS server jsem pouzil BIND a zplodil nasledujici:

named.conf

options {
	directory "/var/bind";
	auth-nxdomain no;
	forward first;
	forwarders {
	dns1.isp.cz;
        dns2.isp.cz;
};

        listen-on { 
	127.0.0.1;
	192.168.1/24;
	192.168.2/24;
	192.168.0/24;
};

	allow-query {
	127.0.0.1;
	192.168.1/24;
	192.168.2/24;
	192.168.0/24;
};
	allow-transfer {
	none;
};

	query-source address * port 53;
	pid-file "/var/run/named/named.pid";
};

zone "." IN {
	type hint;
	file "named.ca";
};

zone "localhost" IN {
	type master;
	file "pri/localhost.zone";
	allow-update { none; };
	notify no;
};

zone "127.in-addr.arpa" IN {
	type master;
	file "pri/127.zone";
	allow-update { none; };
	notify no;
};

zone "mydomain.local" {
	type master;
	file "pri/mydomain.zone";
	allow-update { localhost; key rndckey; };
};

zone "168.192.in-addr.arpa" {
	type master;
	file "pri/192.zone";
	allow-update { localhost; key rndckey; };
};

include "/etc/bind/rndc.key";

192.zone

$TTL 86400	; 1 day
@ IN SOA 	168.192.in-addr.arpa. server.mydomain.local. (
		2004032105 ; serial (YYYYMMDDnn)
		3600 	; refresh
		1800	; retry
		1209600	; expiry
		10800 	; minimum
		)
	IN NS	server.mydomain.local.
 
100.0	IN PTR	server.mydomain.local.
100.1	IN PTR	server.mydomain.local.
100.2	IN PTR	server.mydomain.local.
254.0	IN PTR	firewall.mydomain.local.
1.1	IN PTR	net01.mydomain.local.
2.1	IN PTR	net02.mydomain.local.
3.1	IN PTR	net03.mydomain.local.
4.1	IN PTR	net04.mydomain.local.
5.1	IN PTR	net05.mydomain.local.
6.1	IN PTR	net06.mydomain.local.
7.1	IN PTR	net07.mydomain.local.
8.1	IN PTR	net08.mydomain.local.
1.2	IN PTR	office01.mydomain.local.
2.2	IN PTR	office02.mydomain.local.

mydomain.zone

$TTL 86400	; 1 day
@	IN SOA	server.mydomain.local. root.server.mydomain.local. (
		2004032104 ; ID (YYYYMMDDnn)
		3600      ; refresh
		1800       ; retry
		1209600     ; expire
		10800      ; minimum
		)
	IN NS	server.mydomain.local.
	IN MX	10 mail.mydomain.local.
server	IN A		192.168.0.100
	IN A		192.168.1.100
        IN A		192.168.2.100
firewall	IN A	192.168.0.254
net01	IN A		192.168.1.1
net02	IN A		192.168.1.2
net03	IN A		192.168.1.3
net04	IN A		192.168.1.4
net05	IN A		192.168.1.5
net06	IN A		192.168.1.6
net07	IN A		192.168.1.7
net08	IN A		192.168.1.8
office01	IN A	192.168.2.1
office02	IN A	192.168.2.2
gateway	IN CNAME	server
gw	IN CNAME	server
ns	IN CNAME	server
dhcp	IN CNAME	server
mail	IN CNAME	server
pop3	IN CNAME	server
smtp	IN CNAME	server
imap	IN CNAME	server
www	IN CNAME	server
mysql	IN CNAME	server
ldap	IN CNAME	server

Pri testovani vsechno funguje, nicmene pro jistotu: vidite nekdo nejaky problem, nebo byste to udelali jinak? Diky za nazory.

Odpovědi

[rastos]

Ani nie.

Ja som do options este pridaval toto:

listen-on-v6 { none; };
dialup yes;
minimal-responses yes;

Lebo som mal pocit, ze mi bind robi privela prevadzky. Kazdopadne test by mal spocivat v spravnych vysledkoch normalneho a reverzneho lookupu lokalneho a vzdialeneho stroja.

Neplanujes pouzit nejake logovanie (mne samemu sa nepodarilo logovanie bind-u nakonfigurovat uspokojivo, tak sa chcem priucit )

[Jan Zahoransky]

No ja sa chcem tiez nieco opytat. Mam BINDa a DHCP na MDK s dvomi sietami. Vsetko funguje, len jedna vec ma stve. Nechodi mi preklad IP na mena pre zaznamy, ktore nie su v zonovych suboroch. Ma to vobec fungovat, alebo ak to chcem, tak mi treba aj SAMBU ako WINS server. Pod woknami to tiez muselo byt takto.

[rastos]

Najprv som myslel, ze hovoris o rezolvovani mien mimo svojej domeny. Ale potom som ziskal dojem, ze chces aby stroj vedel ziskat IP adresu ineho stroja na LAN aj ked nie je zapisana v ziadnom DNS.

Nuz WINS zo samby by mohol byt riesenim. MS Win totiz z casu na cas posielaju po LAN broadcasty, kde sa jednotlive stroje predstavuju a WINS tieto informacie zbiera. Druha varianta je mozno nieco co sa vola 'dynamic update'. Hladaj v bind-e klucove slovo 'allow-update' ( nastuduj a potom nas prid poucit )

[Jan Zahoransky]

No skusim, uvidim a dam vediet. Vidi sa mi to praktickejsie ako zadavat vsetky stanice do suborov, ale na druhej strane aspon viem, kto ma ako IP a funguje to tak, ako ma.

[jm]

Ano, pro wokennni stanice je Samba a WINS resenim, pri vetsim poctu Win stanic je WINS stejne nutny, pokud maji mezi sebou nejak rozumne komunikovat a sdilet soubory a tiskarny.

Ad ostatni: vzhledem k celkem malemu rozsahu site jsem tam ty reverzni zaznamy nadatlovoval, pridelovani IP je pres DHCP podle MAC adresy, takze v podstate jsou ty IP staticky.

Parametry allow-update planuju nastudovat, ale to DNS jsem potreboval mit funkcni hned, takze na to dojde event. az nekdy pozdeji.