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.
448
questions
0
votes
0
answers
15
views
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 ...
- 1
0
votes
1
answer
43
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 ...
- 1
0
votes
2
answers
79
views
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 ...
0
votes
1
answer
46
views
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 ...
- 103
0
votes
0
answers
13
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
- 1
0
votes
1
answer
94
views
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 ...
- 1
0
votes
1
answer
56
views
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 ...
- 101
1
vote
1
answer
158
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 ...
- 11
1
vote
1
answer
63
views
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 ...
- 111
0
votes
2
answers
100
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 ...
- 103
0
votes
2
answers
90
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/...
- 1
0
votes
1
answer
120
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 ...
0
votes
3
answers
159
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 ...
- 15
0
votes
0
answers
10
views
Trace Route RTO in two or more hop but next hop works [duplicate]
Today when I was doing tracert,
in the 2nd & 3rd and also 4th Hop I get RTO but my next hop seems to be reachable. How come it works?
Please answer asap.
- 1
0
votes
0
answers
12
views
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 ...
- 1
0
votes
2
answers
39
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 ...
- 9
0
votes
2
answers
104
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 ...
- 63
1
vote
0
answers
779
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....
- 25
3
votes
2
answers
161
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 ...
- 31
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 ...
11
votes
3
answers
8k
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?
- 697
1
vote
0
answers
15
views
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 ...
- 11
1
vote
2
answers
455
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 ...
- 19
2
votes
1
answer
94
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 ...
- 123
0
votes
3
answers
233
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 ...
- 3
1
vote
2
answers
82
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 ...
- 113
-1
votes
1
answer
96
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
0
votes
2
answers
96
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 ...
0
votes
1
answer
151
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 ...
- 101
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 ...
0
votes
2
answers
88
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 ...
- 103
1
vote
2
answers
129
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
...
- 113
0
votes
1
answer
405
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 -...
- 23
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 ...
- 11
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 ...
- 378
2
votes
1
answer
102
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 ...
- 95
0
votes
1
answer
42
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://) ...
1
vote
1
answer
144
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 ...
- 13
0
votes
1
answer
118
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....
- 378
0
votes
2
answers
539
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 ...
- 378
1
vote
2
answers
171
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 ...
- 113
0
votes
2
answers
244
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 ...
- 378
0
votes
1
answer
362
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 ...
- 101
5
votes
1
answer
4k
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 ...
- 153
-1
votes
1
answer
51
views
How can someone connect to my computer even through port forwarding?
If I set port forwarding up on my router to redirect connections on port, say, 50000 to my computer, how can someone connect to my router in the first place ?
Does that mean that my router has a ...
0
votes
2
answers
71
views
network IP packet format
i completely understand that why receiver there is 576 bytes but my question is as technology update every after one Minutes then why we can't update that limit
[enter link description here][1]
9
votes
1
answer
1k
views
What does it mean to “plumb” an IP address?
Plumbing an IP address means what? What are some examples of it?
- 93
0
votes
1
answer
59
views
Can Public IP's ISP location be different from owner organization location?
I'm providing a service that is limited to Singapore only and I've region-blocked any other regions, including USA.
Today a customer from Singapore informed me that he cannot access to my server.
He ...
- 103
0
votes
3
answers
133
views
If person A has a network 123.123.123 and person B has a network 123.123, what happens if they both assign an IP to a device of 123.123.123.123?
This is something I'm confused about...if person A and B have networks with different subnet masks, then what prevents them from assigning an end IP that is identical?
It makes me think I'm ...
0
votes
1
answer
1k
views
How to tell if an ipv4 address is public or private?
I've read the below thing, in a website.
According to standards set forth in Internet Engineering Task Force
(IETF) document RFC-1918 , the following IPv4 address ranges are
reserved by the IANA for ...
- 97