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.

1
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1answer
49 views

Are US ISPs and firms using Chinese registered IPv4 numbers on their routing infrastructure in the US?

Chinese owned/registered IP addresses are appearing within my US ISP routing infrastructure from a trace route. ISP says they are leasing them from China. Has anyone run into this before? With all of ...
0
votes
1answer
81 views

Is it possible for the router to re-direct to another IP? [closed]

This might be a very noob question. Please forgive me if I'm not clear enough, for I don't thoroughly understand the processes / magic very well behind the network engineering. Question: Is it ...
1
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2answers
531 views

Segregate Cisco network using ACL's

I am using a Cisco 1841 router and I have 2 sub interfaces configured. F0/1.10 and 1.20. I would like to stop the devices on VLAN 10 accessing VLAN 20 and visa versa. VLAN 10 is on 10.10.10.1 and ...
2
votes
1answer
7k views

How to communicate between devices on a switch via IP addresses

I understand the differences between a switch and a router, but I don't understand the supposedly common practice of using a switch to extend/expand the number of ports provided by a router and where ...
5
votes
1answer
658 views

Who assigns IP s to the ISP s?

How a particular ISP get it's IP ? Is there any centralized authority to distribute IP s ?
-1
votes
1answer
747 views

Wireshark time to live pattern question

what pattern does ttl usually follows? working with a task where the ttl increments by 1 for every 3 packets. In the other task the ttl does not have any clear pattern. Info: I am doing traceroute ...
3
votes
2answers
829 views

DHCP - Address management during a disconnection

When a host is disconnected, the assigned IP remains unavailable until the end of "lease time" or immediately becomes available to be reassigned? How DCHP manages this?
-2
votes
1answer
220 views

What is the point of the “subnet” concept? [duplicate]

I'm having trouble understand exactly what the point of a subnet is. I read about WHAT it is, and all definitions say something along the lines of that it is a logical grouping of nodes with the same ...
2
votes
1answer
76 views

Valid broadcast and multicast addressing

The other day I ran across a piece of software configured to "multicast" using the address 255.5.6.7. While I've seen local broadcast (255.255.255.255) and "true" multicast (as defined in rfc5771), ...
1
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2answers
220 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 ...
3
votes
1answer
452 views

Cisco DHCP discover with multiple routers - dhcp discover without reply

i have the following network: The lower right router shall be my dhcp server (net 192.168.2.0/24 - ip 192.168.2.3) It shall provide IPs for the upper left and lower left PCs and Printers. The ...
0
votes
3answers
209 views

Find out the IP Address of an Industrial machine controller [closed]

I have an industrial machine controller with an ethernet connection. the Controller is DTU-1000x for a Testing Machine. I need to check the whether the controller has an inbuilt webserver based ...
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
votes
1answer
277 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 ...
-2
votes
1answer
108 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
votes
1answer
677 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 ...