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Questions tagged [ip-address]

A numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.

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What does a byte-boundary mean in this example from Tanenbaum's book on subnetting? [duplicate]

To make CIDR easier to understand, let us consider an example in which a block of 8192 IP addresses is available starting at 194.24.0.0. Suppose that Cam- bridge University needs 2048 addresses and is ...
Don Draper's user avatar
2 votes
1 answer
58 views

How does the final next-hop router forward a frame to the destination device if the public IP address is that of its router

We know that all device’s connected to the same local network will have the same public IP address as each other, which belongs to their local router. So, since the IP packet’s destination address is ...
user94393's user avatar
2 votes
1 answer
75 views

Name for this network range formatting?

I'm working with an FTP server that only accepts IP ranges in this format: 192.168.128-255.0-255 What's the proper name for that format or presentation ? It is none of: CIDR: 192.168.128.0/17 Subnet ...
Criggie's user avatar
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2 answers
56 views

What exactly does the term "main network" mean in subnetting?

In the computer networks course, we solve subnetting questions together with the teacher. There is a term we call the "main network". As far as I understand, we fill in this according to ...
Furkan KARADENİZ's user avatar
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How is the number of sub-networks calculated? [duplicate]

I have lately taking interest in networking so I picked up a book to get acquainted with networking principles. The book I have chosen is that of Glen E. Clarke "CompTIA Network+ ...." which ...
Achraf Badiry's user avatar
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1 answer
67 views

Why is there overlap with two interfaces?

I am trying to configure router0, I assigned ip 192.168.26.1 to gigabitEthernet 0/0 and I tried to assign this ip: 192.168.26.33 to interface serial 0/0/0 but this error appears: 192.168.26.0 overlaps ...
mohdh34m's user avatar
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2 answers
60 views

Forward traffic from one WAN port to the other WAN port on the same triple WAN port router

So here's the situation that I have at my workplace (local municipality): I have received from my ISP a static IP address with a provided gateway, which all works normally when I input it into my ...
NetworkAmateurEnthusiast33's user avatar
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Why the length of IP address is fixed? [duplicate]

Is there technically reason for the fact that the length of IP address need be fixed? Now IPv4 address is 32 bits and IPv6 128 bits. If IP address doesn't need fixed length, we would can structure IPs ...
worner's user avatar
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1 answer
62 views

What is hiearchy of IP addresses? [duplicate]

What is structure/hiearchy of IP addresses? I mean, is mandatory that IP address e.g. 216.9.10.0 is subnet of 216.9.0.0? Of course many times that is the case and IMO it would be logical, but I have ...
worner's user avatar
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2 answers
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Multiple computers disconnect from the network randomly at mostly random times; only fixed by renewing IP

I have recently been made the IT administrator in our organization. We have in-house servers; DNS, Windows Authentication, etc, and we have 2 switches with around 25 computers and devices connected to ...
Alexander Davis's user avatar
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1 answer
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Configuring multiple public IPs in Cisco 881 to forward private IPs with tags while bandwidth balancing [closed]

The ISP is sending four tagged public IPs (VLAN 30) through one WAN cable. Currently, this cable is connected to a switch that recognizes the tag and distributes it appropriately. Naturally, a router ...
Wilhelmroentgen's user avatar
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14 views

about subnetting ip adress 172.16.0.0 [duplicate]

can you explain why we have 172.16.0.0 to 172.31.0.0 so it can't be for example 172.13.0.0 to 172.35.0.0. And also why is 192.168.0.0 and is it possible to be 192.160.0.0? thank you
Giorgi's user avatar
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1 answer
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Basic Networking - IP address

guys, I am currently going through basic networking concepts... There is this piece of information: 'Briefly, an IP address (or Internet Protocol) address can be used as a way of identifying a host on ...
Jan's user avatar
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1 answer
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Accessing a REST API from behind a firewall: whitelist the API's outbound IP addresses?

We have two applications. One application exists behind an on-premise site's firewall. It communicates with our second application, a service app that operates a REST API in the Azure cloud. My ...
StinkySocks's user avatar
1 vote
1 answer
469 views

Explaining the entries in routing table

I would like to ask for help with explaining every particular entry in routing table. That is what I receive after calling route print in my PC, based on Windows: So my understanding is: 0.0.0.0 ...
Bratw's user avatar
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1 answer
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how does a router know an ip address's network prefix when it comes to CIDR

Let's say I start a new company and lease a block of ip address 222.123.123.0/25 from Internet registry, so one of those ip address 222.123.123.4 is my main web server. A customer from a different ...
whoisit's user avatar
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2 answers
128 views

Is there a plausible way to detect an IP address as being hosted on AWS using BYO-IP?

AWS publishes ip-ranges.json, and when a client connects to my system I can search the JSON file to determine if the client is coming from AWS or not. If I don't need to know the AWS region, I could ...
James Healy's user avatar
0 votes
2 answers
160 views

does routers use MAC addresses to map request/response?

we know that Local machines use private ip address inside a company and share a single public ip address when communicate to the outside world, so does routers use MAC addresses to map request/...
whoisit's user avatar
0 votes
1 answer
212 views

Arp and flooding

it is my understanding that nodes are not aware of the mac address of other nodes they want to communicate with, when a frame is created to communicate node A with node B, the destination mac address ...
freman1952's user avatar
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3 answers
345 views

Can I use the network and broadcast IP addresses of a /24 subnet, when the /24 subnet is included in a larger /22 subnet range for NAT?

I'm wondering if I can use the network and broadcast IP addresses of a /24 subnet, when the /24 subnet is included in a larger /22 subnet range for NAT? PS: Please consider that 198.51.0.0/22 is ...
Ulteara's user avatar
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0 answers
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First usable addresses [duplicate]

Network id: 173.128.0.0/18 We have two different networks Network A has 3319 usable hosts and Network B 126 I calculated their subnet masks, but now I am not sure how to calculate their first and last ...
Zhanel's user avatar
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2 answers
50 views

Hop 1 of the traceroute to Internet is not the gateway [closed]

I'm assigned to a public IP address from my organization. Here is my default route: IP: 45.150.164.x Gateway: 45.150.164.1 netmask: 255.255.255.0 And here is the result of traceroute 8.8.8.8 from my ...
wyb's user avatar
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123 views

Customized IPv6 packet with multiple inner data fragments for multiple destinations

I am studying the possibilities of using IPv6 potentialities to design a customized IPv6 data packet that has the following features: 1. Combines many fragments of different data in one packet. For ...
Lee's user avatar
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1 vote
0 answers
1k views

Cannot access to Fortigate FW through mgmt port after forming HA

The two FW are Fortigate WiFi 60E, OS v7.2.0 build1157. The HA connection on the two FortiWifi60E was like PC1-----Fortigate FW1-----Fortigate FW2-----PC2 PC1 IP:192.168.1.100 PC1 default gateway:192....
jacky chong's user avatar
3 votes
2 answers
164 views

in Twice NAT, why cant external network be advertised to private network?

This is from the NAT RCF: The following is a description of the properties of realms supported by Twice-NAT. Network address of hosts in external network are unique in external networks, but not ...
user86942's user avatar
7 votes
9 answers
4k views

Why can I send 127.0.0.1 to 127.0.0.0 on my network?

We have a product that runs over IP. This product comes in two halves that are supposed to be connected directly to each other over Cat 5e. All this works fine. For reasons that are not important, we ...
David Anderson's user avatar
11 votes
3 answers
9k views

Is `0.0.0.0/1` a valid IP address? If so, what does it indicate?

I know that 0.0.0.0/0 represents a default route. But I would like to understand what does 0.0.0.0/1 represents? Is it even a valid thing in networking?
Deepak's user avatar
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1 vote
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Does a router need ARP to send data to router in anther netwrk, it already has the IP address of the interface right?why does it need the MAC address? [duplicate]

i am studying off this https://www.practicalnetworking.net/series/packet-traveling/key-players/#arp but my question is if ip address is for end to end communication , how is the end to end happening ...
Mbaku Baki's user avatar
1 vote
2 answers
472 views

Does IP address identify or locate a host?

Some books say IP address is used to identify the host. Some YouTube videos say that IP address is used to locate the device. It tells us which network the device is located at but it is the mac ...
WorldTreeBoy's user avatar
2 votes
1 answer
105 views

Mask for sending network packets

When sending packets in a network, do the PC's all have to share the same subnet mask or can you dedicate comps to mask addresses? I am wondering if this also determines collisions and if it is a ...
aitía's user avatar
  • 123
0 votes
3 answers
404 views

Lost the Static IP/network settings of a device

We have a physical device (lab instrument) that we can only connect to via ethernet. Unfortunately a static IP was set with network settings and these settings has been lost. We connected our computer ...
Stan's user avatar
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1 vote
2 answers
114 views

What Specifically Happens When You Add a Static IP to a Computer in a Subnet?

This question may be too naive to be Google-able, but I haven't found anything. I'm curious what happens when I go in to a Client device like my personal Laptop and add a Static IP (as opposed to ...
Beasted1010's user avatar
-1 votes
1 answer
143 views

Can octet in IP add be a number greater than 127? cuz, each octet can only can have values in range [-128,127], also are -ve no. common in ip add?

Here is the link of website where they say we can have numbers greater than 127 in 1st octet https://www.informit.com/articles/article.aspx?p=433329&seqNum=5#:~:text=10-,128%E2%80%93191,-C
Sameera Khatoon's user avatar
0 votes
2 answers
102 views

In what context is this IP address / subnet mask valid?

Is this IP address ever valid? I am reviewing a CCNA course taken by thousands of previous students. The information I have isn't in the right order / context, but I noticed that this IP address was ...
CaffeineAddictSendHelp's user avatar
0 votes
1 answer
167 views

How to stop broadcasting WAN network group to LAN network group?

First, I'm not really good at networking terminologies, So I'll explain the case as simple as possible. I have a PFSense set up, my PFsense gets its internet through its WAN IP 192.168.10.2 and ...
Roi's user avatar
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0 votes
0 answers
12 views

What would be the correct way to go about subnetting an IP address for two networks? [duplicate]

I am struggling with how to proceed with this. I have started by converting the IP address into binary. If somebody could just give me a push in the right direction I would appreciate it! There are ...
BabyYoda1665's user avatar
0 votes
2 answers
100 views

Simple IPv6 Global Unicast question

I was reading this article which states: RFC 3587 states that out of the 128 bits in IPv6 addresses, left most three bits are must be fixed as 001. Remaining 45 bits are reserved for global routing ...
questioner's user avatar
1 vote
2 answers
213 views

Why shortened version of IP4 exists and it is undocumented but supported everywhere?

For example there is an IP address 192.168.0.1 It is clear that you can use it as the full line, but try that one 192.168.1 It will also work, and it will be automatically converted to 192.168.0.1 ...
IGHOR's user avatar
  • 113
0 votes
1 answer
523 views

Why is this 254.63.0.1, not a valid host address?

Getting the below error, when trying to configure the ip address 254.63.0.1 as an SVI. Switch(config)#interface vlan 254 Switch(config-if)#ip address 254.63.0.1 255.255.0.0 Not a valid host address -...
user258699's user avatar
0 votes
0 answers
9 views

Why do large companies need public address ranges? [duplicate]

For example google states they own the public address range "8.8.4.0/24". Why would they need a whole block when they could use NAT. What factors contribute to this decision? Is it that they ...
user83511's user avatar
1 vote
1 answer
2k views

What is difference between socket connection and TCP connection?

We know TCP socket is port numbers and IP addresses. Is TCP socket connection is 3-way handshake:the SYN packet, the SYN-ACK packet, and the ACK packet? Is TCP socket connection follows TCP stack? And ...
S. M.'s user avatar
  • 398
2 votes
1 answer
173 views

How is CIDR used in ranges?

There are times where CIDR notation isn't used to subnetting or for routing/summarization but rather just for ranging IP addresses, IPv4 mostly. It seems very non-standard and it seems to be like a ...
Vita's user avatar
  • 95
0 votes
1 answer
59 views

Does socket address include transport protocol (http://)? [closed]

Let's say I have the following: http://ip_addr:port This is supposedly called the socket address (see sources below), but I can't find a conclusive answer anywhere if the transport protocol (http://) ...
Intrastellar Explorer's user avatar
1 vote
1 answer
170 views

What are the commands to configure static routes using next-hop IP addresses?

Given the network topology above and that X in all subnets should be replaced with 1. What are the commands to configure static routes using the next-hop IP addresses on r1 and r2, given that you are ...
Dyson's user avatar
  • 13
0 votes
1 answer
146 views

Understand router Ip address and Mac address, Switch Mac address

Scenario:1 Suppose external Router R1 has interface a connected with interface b of the site Router R2. And Router R1 using IP address 80.0.0.0/8 for a. Router R2 has 4 subnets 80.0.0.0/10, 80.64.0....
S. M.'s user avatar
  • 398
0 votes
2 answers
661 views

Acknowledgement, retransmission of layer2 is actually belongs to layer4?

I followed from this question understand that only transport layer responsible for acknowledgement. But I have read on book stop and wait, GBN, SR protocols uses acknowledgement, retransmission in ...
S. M.'s user avatar
  • 398
1 vote
2 answers
187 views

How are IP address compared to the default 0.0.0.0/0 or ::/0 on binary level?

Let's say I have an ipv4 destination address - 63.168.52.12 In binary format the address: 00111111.10101000.00110100.00001100 The default route in binary is 00000000.00000000.00000000.00000000 I am ...
Cruise5's user avatar
  • 113
0 votes
2 answers
278 views

Could we use private IP address as directed broadcast address?

We know that private IP addresses ranges of class A, class B, class C are 10.0.0.0-10.0.0.255, 172.16.0.0-172.16.255.255, 192.168.0.0-192.168.255.255 respectively. My first questions is that first and ...
S. M.'s user avatar
  • 398
0 votes
1 answer
565 views

How can I test if the subnet mask and default gateway are set for a device? [closed]

I understand how subnet masks work mechanically and how to convert from the mask to the CIDR bits notation, and I understand the concept of a default gateway. What I don't understand is what setting ...
nullromo's user avatar
  • 101
5 votes
1 answer
5k views

Does an unmanaged switch deal with IP addresses at all

My belief is that an unmanaged plug-and-play layer 2 network switch only deals with MAC addresses. When computer A on a local network wants to communicate with computer B for example through the ...
Engineer999's user avatar

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