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.
817
questions
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10 views
How to route inbound cloud traffic back to my home PC? [closed]
While traveling away from home, I want to connect to services hosted at my home but without directly using my home IP address. I'm wary of other hotel guests, Starbucks patrons, any bad actors thereof,...
0
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0answers
12 views
Port Forwarding and static IP without router access [closed]
I am living without access to my router or any webGUI, but I am trying to make a self hosted home server which I would like to open up and expose to the internet. I am would love to give myself a ...
0
votes
1answer
24 views
Connecting to device which requires specific IP [closed]
[Disclaimer: I'm a complete networking novice, and this question might not even be well suited for this site. I welcome pointers to other stack exchanges if appropriate.]
I'm trying to connect a ...
0
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0answers
8 views
How to select CIDR blocks when subdividing a network? [duplicate]
I saw these two questions, but they are still too over my head and start too far along the path:
How to divide network into subnets?
How do you calculate the prefix, network, subnet, and host numbers?...
3
votes
1answer
55 views
What are usecases for IPv6 link-scope anycast?
IPv6 Neighbor Advertisement messages have a flag called Override, see RFC4861. It toggles, whether the receiver of the message should remove other link-layer addresses for the same IPv6 target address ...
0
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1answer
27 views
What are some techniques to infer the subnet being used? [closed]
Given a list of thousands of IPv4 addresses and that you have no direct access to these hosts, is there a service or a methodology to infer a subnet that's possibly being used?
0
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1answer
23 views
BGP - Active\Passive Setup, except one AS
I have two transit providers, A and B. The business has chosen to make provider A more attractive due to billing concerns (we get attractive bulk pricing from this global provider). This was done by ...
-1
votes
1answer
29 views
different network mask and subnet mask and netmask [duplicate]
1- what is network mask?
2- what is subnet mask?
is there any differnt between network mask and subnet mask?
i'm tried to search about network mask and nothing found is it called netmask ?
thank you
0
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3answers
72 views
32 bits or 30 bits for subnet mask
I'm new to networking and have a question about subnet masks. Imagine we have a class B IP address. I know how to calculate the subnet mask. My question is: What is the last subnet mask that we can ...
0
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2answers
31 views
Is it possible to completely mask an IP address to a point where no IP address can be detected yet an active connection is live?
I’ll keep it short and sweet;
We all know to connect to internet you’ll need an address like 2001:x** or 192.x**.
Using a vpn, while it does encrypt things and mask your IP, it still returns an IP.
...
-2
votes
1answer
24 views
How UDP protocol Number is 0x011?
How UDP protocol number is 0x11 when it's supposed to be 0x17 According to ianna website
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3answers
62 views
Assigning IP addresses to multiple switches
Thank you in advance for taking the time to read my question, i appreciate it. I am in need of help on IP assigning to 4 brand NEW Araknis switches that I am replacing with the current netgear/tp-link ...
0
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2answers
29 views
multicast udp streaming dst and src address assignment
If I am streaming on a host using the internet outside my nat, how is multcast addressing work with respect to streaming for example, if the application outside sends to 224.0.0.1 how is the packet ...
0
votes
1answer
60 views
Extra IPv6 Addresses - where are they coming from? [closed]
I recently got assigned a block of IPv6 addresses by my ISP. I've set it up with prefix delegation and it works just fine. When I plug a NIC in on the network it quickly picks up an IPv4 address from ...
0
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2answers
26 views
Can a Subnet have more than one CIDR range?
For many years I thought of a subnet as a single contiguous range of ip addresses expressed using CIDR notation.
However on GCP a subnet can have a primary ip address range from which VMs get ...
0
votes
1answer
38 views
IPs that cannot be used
I'm new to networking. I know that some IPs cannot be used and we cannot consider them when dedicating an IP. I know some of them such as:
Net ID Addresses
Loopback IP Addresses
Broadcast IP ...
0
votes
1answer
30 views
IPs that don't have subnet mask
I'm new to networking. I know that some IPs don't have a sub net mask like 127.0.0.1 and the range that starts with 127. I wanted to know if there is any other IPs that don't have sub net mask.
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2answers
257 views
Prevent TCP sequence prediction attack
Let's say an attacker gets the sequence number between me and my client. Now he continues the conversation with me and has changed the IP address.
How do I prevent packages from being sent to ...
0
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2answers
39 views
Modify the IP in TCP/IP packet
My ip address is specified in the ip packet sent to the next node. I wonder if a device that handles this packet can modify the ip address before forwarding it to the final destination?
In theory ...
0
votes
1answer
22 views
Why we use IP address in sockets? [closed]
When a server want to create a socket, it will use a combination of its IP address and some well-known port, let us say 80.
So, when a segment arrived, both the server IP and port 80 will be used to ...
2
votes
2answers
86 views
What Does a Private IPV6 address look Like?
I'm doing a presentation on how the internet works, and I'm wondering if there is even such a thing as a private IPV6 address. If so, what does a private IPV6 address looks like?
1
vote
1answer
87 views
What is the last usable address in an IPv6 network
IPv6 does not have broadcast, so is the last address usable? Besides it being long, is it bad practice to actually use it?
For example: A:B:C:D::0/64 starts with A:B:C:D:0000:0000:0000:0000 and ends ...
0
votes
2answers
32 views
why ip protocol use fragment offset instead of index number?
I was wondering why the IP protocol use fragment offset to define the fragments of an IP datagram instead of using index number (first fragment with index 0, second with index 1, ...). We already know ...
0
votes
3answers
24 views
Forwarding and routing table for host [duplicate]
I'm new to computer networking and from what I've studied, I've understood that
Forwarding tables map MAC addresses to ports. So they are used by switches.
Routing tables map IP to IP ..they define ...
0
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0answers
14 views
VLSM Scheme Approach [duplicate]
I have been asked this question in a Cisco Packet Tracer. It is testing my knowledge of designing and implementing a vlsm addressing scheme.
The requirements are:
You will subnet the network ...
1
vote
0answers
40 views
In Bgp TTL security all control packets will have configured hop value?
Topology:
loop(2.1.1.1) - routerA (192.168.1.2)--------- (192.168.1.1) routerB - loop(1.1.1.1)
I have eBGP peering configured with a Multihop of 2 on both sides and static routes to reach loopbacks.
...
1
vote
1answer
42 views
Extract upstream/downstream ASNs from BGP table path
I want to extract upstream and downstream ASN for any given ASN, for example:
https://www.cidr-report.org/cgi-bin/as-report?as=AS4826&view=2.0
My goal at the end is to generate ASN route graphic ...
0
votes
1answer
19 views
Length of Version field in IP Datagram header
I have doubt regarding length of "version" field in IP datagram. I have read the possible values are either 4 or 6 but they can represented in binary as 100 and 110, which are 3 bits in length. Then ...
0
votes
1answer
60 views
When the first bit reaches the host B, which bit is exit from the host A?
When the first bit reaches the host B, which bit is exit from the host A?
0
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1answer
62 views
What steps must be accomplished in each layer of the TCP/IP model to connect a website?
What steps must be accomplished in each layer of the TCP/IP model to connect a website?
24
votes
3answers
6k views
Will IPv6 make private IP addresses become obsolete?
Will it still be useful to make use of private IP addresses with IPv6?
0
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0answers
31 views
Locating where an IP address lives
Without documentation or using console how can I locate a particular IP within my network? Specific issue is I have public IP sitting on a device at a datacenter. The IP address appears to be going ...
0
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0answers
9 views
Find device hosting server on the same network without knowing the local IP [duplicate]
I am developing a Java app that hosts a socket server. This server will exchange information with a mobile app connected on the same WiFi network.
I am trying to create a seamless experience that ...
1
vote
0answers
29 views
If a server has both IPv4 and IPv6 addresses, how does the DNS determine which to return? See the following example [closed]
These Pings were done at different times of the same day:
C:\Users\LPress>ping www.ucla.edu
Pinging gateway.lb.it.ucla.edu [164.67.228.152] with 32 bytes of data:
C:\Users\LPress>ping www.ucla.edu
...
1
vote
1answer
52 views
IPv6 SLAAC and Static DAD
I started learning about IPv6 and I wonder what happens when you mix SLAAC and static addresses in the same /64.
My current understanding is as follows:
Machine A with a statically configured ...
0
votes
1answer
43 views
How can I use 1 static public IP address for multiple private networks in totally different physcical locations?
So, I know that DNS is important in the running of CDN services. DNS allows the routing client traffic to the physically nearest CDN server. Question is, how can I do the same thing without any DNS ...
0
votes
1answer
45 views
Does Internet Stream Protocol (IP version 5) work on the Internet?
IP with version number 5 is dedicated to the Internet Stream Protocol. Can you send such a packet on the internet at large, or will it be blocked/discarded?
1
vote
2answers
36 views
What is the suitable private IP? [duplicate]
What is the private IP that I may use if I am about to subnet a total of 743 hosts in my office? Should I use 10.x.x.x, 172.16.0.0 - 172.31.x.x, 192.168.x.x or all of them are allowed? Also if more ...
15
votes
3answers
2k views
Is it possible to specify a route for a packet to take?
So, AFAIK, packets "hop" between routers. Packets are forwarded via a router's default path until it gets to destination IP. So is it possible to specify a specific set of routers this packet "hops" ...
0
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0answers
8 views
Does 10.10.192.0/20 represent the same number of address with 10.10.195.0/20 [duplicate]
I knew 10.10.192.0/20 can represent the ip addresses from 10.10.192.0 to 10.10.207.255, but I'm confused how does 10.10.195.0/20 represent? I guess it is same with 192.0/20 right?
1
vote
2answers
62 views
Why does a Router need to have a seperate IP for every network?
Assuming we have a router connecting 4 different networks, with the prefixes 00, 01, 10 and 11, the router would need to have an IP address with such a prefix in each network, to be addressable as the ...
0
votes
3answers
158 views
Clarification on when routers encapsulate and decapsulate packets
I'm an application developer working on getting a working knowledge of network engineering, so basically a newbie. I've been trying to figure out exactly when routers decapsulate frames into packets ...
1
vote
1answer
68 views
IPv4 maximum datagram size
The IPv4 datagram consists of two parts:the header length and the payload. The maximum header size is 60 bytes and minimum is 20 bytes. The maximum size of the data can be 65515 bytes. So why the ...
1
vote
2answers
147 views
Can link local addresses be used for transit networks without breaking routability?
I am asking this because my ISP uses SLAAC/DHCPv6 to assign addresses to clients. Firewalls, no matter what brand/name/type get a link local IPv6 address complete with a link local gateway AND clients ...
1
vote
1answer
146 views
Broadcasting to unknown Class C Network
I am trying to use python to broadcast to my local network, and I cannot find a way to get the subnet mask. I have been suggested to use the default Class C network subnet mask 255.255.255.0, and use ...
1
vote
2answers
46 views
Where are broadcast packages filtered out
When I have one network with a switch. Within that network I have 10 PC. Halve of them are configured within the 192.168.1.0/24 range and the other halve is configured at 192.168.2.0/24.
This means I ...
0
votes
1answer
39 views
Find Routes not containing these subnets [closed]
Let's say I have 1000 ranges and I would like to make routes that doesn't match these ranges, anyone has any particular tips or tools to share beside doing math ?
Example :
I have these ranges
13....
2
votes
1answer
78 views
Why Classful addressing is not in use if we can subnet them?
So,
Let's think that organization needs 5000 IP addresses. Giving 20 C Class IP addresses will cause of adding 20 entries for ISP router. That's problem. We could give Class B IP address, but that ...
1
vote
1answer
88 views
Are subdomain and subnetting related concepts?
Recently while trying to grasp some basic networking concepts - I felt subdomain and subnetting are related concepts and wanted this group to confirm and add more insights on this.
I understand that ...
1
vote
1answer
103 views
Confusion about TCP/IP data flow in layers
I'm confused about how the data flows through the layers of the TCP/IP model, so I'll just tell what I think it happens (using an email example) and I'd appreciate if you can point my mistakes.
...
