Questions tagged [ip]

For questions about Internet Protocol (IP), an OSI layer-3 network protocol. There are two current IP versions in use: IPv4 and IPv6.

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5
votes
3answers
1k views

how IPv4 routing is done for TCP? as TCP is connection oriented but IP is not

In connection oriented networks, the source first establish connection with destination before sending packets. When a connection is established sequence of packets are sent on that connection which ...
3
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5answers
20k views

Identifying an IP address conflict through a Cisco Switch

I have a 3550 Catalyst Switch. 2 computers connected to the switch have the same IP address configured and there is an IP address conflict. How do i zero in on these computers with just the CLI of ...
10
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3answers
13k views

Is a TCP three-way handshake required for an HTTP POST?

I don't quite understand if i posting http form data from the browser to the server, does the protocol still need to make three-way handshake (syn-ack-data) or it only works for GET http requests?
1
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2answers
261 views

Function of network switch for IP traffic

Suppose two computers and a router are connected to a layer 2 ethernet switch. Both computers are registered on the router's IP network. The user of computer 1 sends an ICMP ping request to computer 2 ...
1
vote
1answer
5k views

Subnetting a subnet - VLSM

This is from a fake test before the real exam. It's a course which goes through Cisco academy - a course in networking. Use the address space 10.10.16.0/24 to design an addressing scheme. a) ...
2
votes
1answer
921 views

DF bit always set for DNS query response

When I tried packet capture with wireshark, I observed that the Don't fragment bit is always set for 1. all TCP packets and 2. DNS query response. I understood why it is so in case 1, here Now, my ...
4
votes
2answers
12k views

Implementing a secondary IP address?

I am familiar with adding a secondary ip address to cisco device interfaces in order to work around corner case scenarios, for example having 2 ip subnets within the same vlan, needing to expand when ...
7
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1answer
53k views

How to divide network into subnets?

I've been trying to figure out how to divide a network number into particular subjects where one of them require a particular number of hosts. I have the Computer Networking: A Top Down Approach but ...
-2
votes
1answer
114 views

How do I receive packets to my private ip from outside out of my network

I took 4 classes in networking. I have a doubt. If I am downloading something from say mp3skull.com . My private ip address is say 10.155.23.143 and ip address of company A, which provided me the ...
2
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2answers
450 views

How subnetting works on network design?

Maybe this question is very easy for some people. I know very basic of networking and I am trying to learn more. I have followed tutorials on Microsoft and I read this: Using a subnet mask of 255....
2
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3answers
9k views

Determining Host portion from a given ip address

I need to determine the subnetmask and Host Id of a given address: 175.142.213.217/22 This is what I have so far: Address: 01010111.10001110.11010101.11011001 SubnetMask: 11111111.11111111....
6
votes
3answers
32k views

Setting subnet mask to 255.255.255.255

If I want just 1 device to be on the network, can I set the subnet mask to 255.255.255.255? For example, the consider the network card configuration IP 10.0.0.10 mask 255.255.255.255 ...
2
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2answers
618 views

IP stack and loopback address

The IP address 127.0.0.1 is used to test the IP stack on an individual node. What is IP stack here ?Some blogs redirects this question to TCP/IP stack.But I am unable to co relate and understand it.
-2
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1answer
94 views

give several subnet ip from one switch

I have a network and I have 2 subnets from ISP. Can I give these 2 IP to router from switch like it is shown in this figure: I know, I can give to one physical port, but I want now about realisation ...
14
votes
3answers
32k views

How broadcasting works on different networks?

I was reading DHCP ( RFC 2131 ), I have basic knowledge about Relay Agent and Broadcasting. But for Understanding DHCP in depth, I felt like I have to know Broadcasting and Relay Agent ( RFC 1542 ) in ...
10
votes
2answers
856 views

ipv6 Aggregatable global unicast addresses

Studying IPv6 addressing I haven't understood IPv6 aggregable global unicast addresses, I mean on RFC 4291 there is a generic scheme: | n bits | m bits | 128-n-m bits ...
3
votes
1answer
343 views

Why can't you use dynamic nat on server?

We use static NAT for servers in a LAN. But using dynamic NAT doesn't have any effect, then why is it a standard? Is it because of the overhead faced by the server, to map each connection/request to ...
8
votes
2answers
7k views

Duplicate IP Address Prevention?

Yesterday a laptop crashed the network because the IP address of the computer was the same as the router. Computers in the network were reaching the laptop instead of the router. Is there anyway to ...
121
votes
6answers
750k views

How do you calculate the prefix, network, subnet, and host numbers?

Example: IP: 128.42.5.4 In binary: 10000000 00101010 00000101 00000100 Subnet: 255.255.248.0 How could you determine the prefix, network, subnet, and host numbers?
2
votes
1answer
380 views

Internet Protocol. Source Routing. RFC 791. Are the addresses in the Source Routing option 1-indexed?

I was reading pages 18-21 in RFC 791 about the Internet Protocol and in the sections on Loose Source and Record Route (LSRR), and Strict Source and Record Route (SSRR), and Record Route (RR) it says ...
0
votes
1answer
740 views

TCP/IP Header compression

I'm reading RFC 1144 and I'm trying to figure out how the TCP/IP header compression works. As I understand it, the sender only sends a couple of fields that are likely to be changed. If the packet ...
39
votes
4answers
23k views

How to check for a valid public IP address?

Consider a list of IP addresses as provided by the X-Forwarded-For HTTP header: 10.0.0.142 , 192.168.0.10 , 212.43.234.12 , 54.23.66.43 I would like to know which is the first publicly-accessible ...

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