Which authentication types does OSPF support?

Which authentication types does OSPF support?

Discussion. RFC 2328, which defines OSPF Version 2, includes three different types of authentication for OSPF: null authentication, simple password authentication, and cryptographic authentication. …

What is ip OSPF authentication?

OSPF can be configured to authenticate every OSPF message. This is usually done to prevent a rogue router from injecting false routing information and therefore causing a Denial-of-Service attack.

Which two secure authentication types can be used with OSPF authentication on Cisco IOS routers?

OSPF authentication can be enabling in two ways: 1) Per interface: Authentication is enabling per interface using the “ip ospf athentication” command. 2) Area authentication: Authentication for area can enable using “area authentication” command.

What are the different configurations of OSPF?

Table 3 OSPF Basic Configuration— Individual network statements

Does OSPF support packet authentication?

OSPF carries authentication types in packet headers and authentication information in packet tails.

What is plain text authentication?

The PLAIN authentication mechanism (RFC 2595) specifies that three strings be sent as one item of data (that is, one combined string containing two NUL separators). The data is sent either as part of the AUTH command, or subsequently in response to an empty prompt from the server.

What is MD5 authentication?

MD5 authentication—Authenticates by using an encoded MD5 checksum that is included in the transmitted packet. The receiving routing device uses an authentication key (password) to verify the packet. You define an MD5 key for each interface.

What types of authentication are supported in Junos for OSPF?

In Junos , OSPF authentication can come in one of three ways; none, simple or MD5. The default is to have no authentication. This means that the router will form a neighbor relationship with a neighboring router as long as the proper fields in the OSPF Hello’s are matching.

What are the five OSPF network types?

There are 5 OSPF network types:

• Non-Broadcast.
• Broadcast.
• Point-to-Multipoint.
• Point-to-Multipoint Non-Broadcast.
• Point-to-Point.

How many OSPF areas can be configured?

You can configure up to 4294967295 areas in one OSPF process id.

What is the difference between plaintext and cleartext?

Cleartext has not been subject to encryption whatsoever, and there is no expectation that it has been. Plaintext, the latter, specifically refers to information that is inputted into a cipher, or encryption algorithm.

What is OSPF MD5 authentication?

OSPF MD5 Authentication ensures that an unauthorized IP resource cannot inject OSPF routing messages into the network without detection, thus ensuring the integrity of the routing tables in the OSPF routing network. OMPROUTE computes a secure MAC for the routing message using the MD5 algorithm.

What is MD5 and SHA1?

MD5 stands for Message Digest. While SHA1 stands for Secure Hash Algorithm. 2. MD5 can have 128 bits length of message digest. Whereas SHA1 can have 160 bits length of message digest.

What are the six OSPF route types?

This is the prefered path list that OSPF uses:

• Intra-Area (O)
• Inter-Area (O IA)
• External Type 1 (E1)
• NSSA Type 1 (N1)
• External Type 2 (E2)
• NSSA Type 2 (N2)

How many types of OSPF are there?

6 Types of OSPF LSA.

What are the 5 types of OSPF packets?

Packet types for OSPF

• Hello packet. This packet is sent by the OMPROUTED server to discover OSPF neighbor routers and to establish bidirectional communications with them.
• Database description packet.
• Link-state update packet.
• Link-state request packet.
• Link-state acknowledgment packet.

What are the 7 stages of OSPF?

The states are Down, Attempt, Init, 2-Way, Exstart, Exchange, Loading, and Full.

What is cleartext authentication?

Cleartext is transmitted or stored text that has not been subjected to encryption and is not meant to be encrypted. As such, cleartext does not require decryption in order to be displayed. In its simplest form, cleartext is rendered as ASCII that can be read by any word processor or text editor.

What is the difference between a private key and a public key?

Private key is used for both encrypting and decrypting the sensitive data. It is shared between the sender and receiver of encrypted data. Public key is used only for the purpose of encrypting the data.

How do I configure MD5 authentication?

For MD5 authentication you need different commands. First use ip ospf message-digest-key X md5 to specify the key number and a password. It doesn’t matter which key number you choose but it has to be the same on both ends. To enable OSPF authentication you need to type in ip ospf authentication message-digest.

Which is better MD5 or SHA?

To conclude, MD5 generates a message digest of 128-bits, while SHA1 generates a message digest of 160-bit hash value. Hence, SHA1 is a relatively complex algorithm and provides better security than MD5.

Why is SHA stronger than MD5?

Although slower, SHA is more secure than MD5 due to a variety of reasons. First, it produces a larger digest, 160-bit compared to 128-bit, so a brute force attack would be much more difficult to carry out. Also, no known collisions have been found for SHA.

What are the four 4 types of OSPF routers?

Four Types of OSPF Routers

• Routers for internal use: Internal routers. Internal routers are routers that belong to the same OSPF region as their directly connected networks.
• Area Borders Routers.
• Autonomous Systems Boundary Routers.
• Backbone Routers.

What is 2-way state in OSPF?

2-Way State

This state describes the Bi-Directional communication state, Bi- Directional means that each router has received the other’s Hello packet and that each router can see its own Router ID included within the Hello packet’s neighbor field.

What is 2 way state in OSPF?

2-Way. This state designates that bi-directional communication has been established between two routers. Bi-directional means that each router has seen the other’s hello packet. This state is attained when the router receiving the hello packet sees its own Router ID within the received hello packet’s neighbor field.