- 6.2.1 Server ns.company.com 138.
- NewYork.com.
- computer.abc.company.com .
- 1.9 Name Server.
- Table 2.1: The most common RR.
- On the contrary, if the query is sent by a name server, it is usually marked with a tag showing it is an interactive query, i.e., the name server asks another name server to help it with the translation, but does not send a recursive query as it is able to arrive at what it needs by iteration..
- QTYPE specifies the query type, i.e., the RR type required in the answer.
- TTL: RR expiry date, i.e., the time an answer can be kept in a server cache as valid..
- Name server: d.l.google.com.
- Name server: e.l.google.com.
- Name server: g.l.google.com.
- Name server: a.l.google.com.
- Name server: b.l.google.com.
- 0 would indicate the first byte, i.e., the ID field in the header section..
- packpub.com.
- packtpub.com.
- Table 3.1: The meaning of individual control fields.
- FORMERR 1 Message format error—the name server is unable to interpret the request..
- One DNS Update request can only be used for updating one zone, i.e., the zone section only authorizes one record to be used..
- mail.company.com.
- A www.company.com.
- company.com.
- mail.company.com domain name..
- mh.company.com.
- The master server then sends the changed records to the slave server, i.e., the records that are to be removed as well as new records.
- Now, where to define the TTL of a negative answer if the negative answer does not usually contain any RR record in the reply section (as shown in the first example of Section 2.3.8)? The TTL for the negative answer is defined in the way that the zone SOA record is inserted into the authoritative section of the answer..
- $ORIGIN company.com.
- IN PTR ns.company.com.
- IN PTR www.company.com.
- o Setting the X bit specifies that the KEY record contains an extended Flags field, i.e., the Algorithm field is followed by another 16 bits of the Flags field..
- 01: The record contains a zone key, i.e., the key that the primary DNS server will use for signing the zone data electronically..
- The zone name (i.e., the DNS name) is the last parameter..
- Only the two NA bits are set to the value of 01, i.e., the key cannot be used for encrypting (the DSA algorithm is not suitable for encrypting)..
- department.company.com.
- Figure 3.5: The RDATA field of the SIG record.
- SIG KEY company.com..
- The label field contains 2 since the DNS name of company.com consists of two chains, i.e., the company chain and the com chain.
- department.company.com..
- It is worth mentioning that the department.company.com zone key (KEY record) is already signed by a different key—the key of the superior company.com zone (SIG record).
- IN SOA ns.company.com.
- dostalek.company.com.
- company.com..
- IN NS ns.company.com..
- 1 department.company.com.
- 2 IN NS ns.company.com..
- Imagine that the zone is a cycle, i.e., the first record follows the last one.
- Figure 3.6: The RDATA field of an NXT record.
- ;server.department.company.com.
- dostalek.company.com..
- computer.department.company.com.
- department.company.com..
- 99999 NS ns.company.com..
- 99999 NXT department.company.com.
- ;department.company.com.
- When doing this, they can also take out or switch SIG records, i.e., the digital signature..
- This SIG record digitally signs the server reply including the request section (i.e., the resolver's request).
- Because the @ symbol has a special meaning in a SOA record, a dot must be used in the mailing address in place of it, i.e., the address will be hostmaster.company.com instead of
[email protected].
- company.com IN SOA.
- The name server of the branch.company.com domain, i.e., the authoritative name server of a lower-level domain has the following database available:.
- branch.company.com IN SOA.
- mail.company.com computer.
- 1 IN PTR ns.company.com..
- Let us assume that our company ( company.com ) has assigned IP address interval i.e., the whole class C network.
- In the ns.company.com name server (primary name server):.
- You are probably expecting that it will be pointed out that the synonym (CNAME) must not be on the right side, i.e., the PTR record cannot point to a CNAME record.
- branch.company.com.tmp .
- Caution! If you decide to define a view within the named.conf file, then all zones must be a part of some view, i.e., the named.conf file will be divided between the individual views..
- (Secondary zone in the previous version of BIND.) The list of masters specifies one or more IP addresses of master servers the slave contacts to update its copy of the zone.
- $GENERATE 1-2 0 NS server$.company.com..
- (The ld.company.com record was created automatically because this is my computer's name.) The result is shown in Figure 4.3..
- administrator.company.com ( 2 .
- NS ld.company.com..
- Name: www.company.com Address .
- ->company.com.
- origin = mh.company.com.
- >ls –d company.com.
- contact=dostalek.company.com.
- hostmaster.company.com.
- IN NS mh.company.com..
- hostmaster.company.com .
- $ORIGIN company.com..
- $ORIGIN unl.company.com..
- Another USR1 signal increases the debugging level, i.e., the quantity of recorded information..
- (Windows 2000/2003 has a similar configuration.) The administrator wants to administer the secondary name server on an ISP name server called ns.provider.net.
- 6.2.1 Server ns.company.com.
- to the name server ns.company.com .
- Server ns.company.com.
- This branch uses 128 IP addresses, i.e., the subnetwork .
- Figure 9.2: The intranet name server is trying to contact (unsuccessfully) root name servers in the Internet.
- Figure 9.3: The intranet root name server returns a negative reply.
- ns2.company.com servers.
- IN NS ns1.company.com..
- IN NS ns2.company.com..
- ns1.company.com.
- ns2.company.com name servers (that they are identical is a mere coincidence)..
- ns-root.company.com.
- company.com .
- ns2.company.com name servers..
- 10.1.1 The Whole Internet is Translated on the Intranet.
- name server