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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2answers
46 views
How to do subnetting on IPV6 for non nibble boundaries?
As I was reading this article on How to: calculating IPv6 subnets outside the nibble boundary https://blog.apnic.net/2018/08/10/how-to-calculating-ipv6-subnets-outside-the-nibble-boundary/
The author ...
0
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0answers
11 views
Linksys E1200 Gateway [on hold]
I received static ip data from the provider. It's like this:
ip: x.x.x.1/31
sub: 255.255.255.254
gateway: x.x.x.0/31
DNS: x.x.x.x and x.x.x.x
When I try to enter the gateway in linksys E1200, it ...
0
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0answers
13 views
Accessing my server through work networks [on hold]
So before I explain this.. this is something I am allowed to do at my work.. So I am not breaking any sort of rules in that sense!
I have a simple server running on my Mac. I then forwarded ports on ...
1
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1answer
26 views
Remote Host Neighbor Cache Entry State after Neighbor Solicitation request
When a Host A sends for the first time a NS request to another Host B, host B answers with a NA.
In Host A Neighbor Cache, the state Entry for host B gets from INCOMPLETE to REACHABLE, when NA comes ...
0
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2answers
67 views
Why can't we have duplicated IPs?
This may be a really dumb question, but I like to turn upside down what I already know sometimes, that way I can learn more.
For example, given a network 192.168.0.0/24, I have a device inside with ...
-1
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1answer
37 views
IP Camera (CISCO Packet Tracer)
I've been asked to simulate a topology, which requires me to implement 2 CCTV cameras in a network using Packet Tracer. However I realise that their isn't IP Cameras in PT, so how best can I simulate ...
1
vote
1answer
69 views
How does IP assignment work for servers and data centers
If I had an IP address (for example bought range for my company), and 2 ISPs fibres, how would it be possible to set my network card to have same IP adress accessible from both connections? (know its ...
0
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1answer
13 views
Varible Length Subnet Masking - Smaller subnet with two larger subnets on each side?
Background:
I'm redesigning a network of virtual machines. The virtual machines are all on 10.0.2.0/24 and 10.0.3.0/29 networks, the physical network is a 172.32.255.225/28 network, which stands ...
8
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6answers
4k views
Could IPv6 make NAT / port numbers redundant?
From what I can tell, each process could get its own IP address, with loads of IP's to spare.
What would the drawbacks be?
Essentially, your host would become a router and each process is a host (in ...
0
votes
1answer
29 views
What happens if we try to access an IP Address that does no exist
Beginner Question: I just read an article talking about how the internet works and how routers make sure that packets arrive at the destination. However there is one thing that is not explained ...
2
votes
1answer
70 views
Setting Destination MAC address for RTP/UDP packets
I have a requirement where I have to send the UDP packet to a destination multicast IPv6 address. In addition to that the packets must also have corresponding destination multicast MAC address set. I ...
1
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0answers
19 views
routing with multiple NICs (connected to multiple APs) that were all assigned the same LAN address [closed]
I have 4 wireless APs based on the ESP8266. These APs all broadcast distinct SSIDs, but each serves LAN addresses in subnet 192.168.4.XXX. The subnet value is not configurable.
Then, I have a Linux ...
2
votes
1answer
38 views
Why does TCP need segments if the network layer automatically breaks things up into fragments?
I'm trying to better understand the difference between IP fragments and TCP segments (https://www.shubhsblog.com/tech/difference-ip-fragmentation-tcp-segmentation.html) and there's one thing I'm not ...
0
votes
1answer
46 views
How to get a static IP address? [closed]
I need to get a static IP address to access to a service that only allows specific IP (I can manage the whitelist).
The problem: my public IP is dynamic.
I'd like to :
be able to activate this ...
0
votes
2answers
65 views
Why does Nmap not detect a host which is active and responds to Ping?
I have connected to another laptop via the LAN cable, i am able to access the services running on the other laptop via Ip & Port. When i Ping that Ip, the machine is successfully responding. But ...
0
votes
0answers
13 views
IP block assignment [duplicate]
Let's say that an ISP manages the IP block 128.64.32.0/19, and assigns the block 128.64.32.0/22 to company A. Now, company B needs a block of IP addresses for 1234 hosts, immediately after the IP ...
0
votes
1answer
27 views
localhost vs local IP address: traffic flow [closed]
Let's say I have a server with IP address 192.168.0.1 that is running a network service (I don't think it is important what kind - let's say a webserver on port 80).
If I am on the server itself and ...
2
votes
2answers
56 views
Do extension headers in IPv6 increase the header length
I was reading about IPv6. It says the header is of a fixed size i.e. 40 bytes, then how come is it able to accommodate extension headers. Doesn't this alter the size of headers.
Please help, cant ...
2
votes
2answers
51 views
How to handle ICMP-in-IPv6 or ICMPv6-in-IPv4?
Since ICMP and ICMPv6 have different IP protocol numbers, it's technically possible for an IPv4 host to receive an ICMPv6 packet or for an IPv6 host to receive an ICMP packet. Is the host's behavior ...
4
votes
2answers
2k views
IP addresses from public IP block in my LAN
If I have NAT or PAT applied on edge router, Would it matter if I use IP addresses from public block in my LAN? And how?
1
vote
1answer
31 views
How to tell apart the type of the mask(subnet-supernet-net mask)
Say we have the the IP address 10.2.8.230/24
Anyone could say the following:
It just represents a normal network:10.2.8.0/24
Or it is a subnet because normally this IP address is in the class A ...
1
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3answers
123 views
Is IP an abstraction
If packets "hop" from network device to network device across networks using MAC addresses, resolved by ARP, does this suggest that IP is essentially an abstraction?
By abstraction, I mean, the ...
0
votes
2answers
63 views
What does it mean when the last digits of an IP address change? [closed]
So in a case where I have an IP address, 162.158.68.xxx, what is happening when those values in xxx change?
I ask because I'm looking at requests going through to my application's server and one of ...
0
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2answers
42 views
Addressing for a WAN, LAN and DMZ
I was wondering about the addressing for certain types of networking areas...
I use 192.168.0.0 for a LAN network, 10.0.0.0 for a WAN and 172.16.0.0 for a DMZ. But I've been confused why a 10.0.0.0 ...
2
votes
1answer
74 views
Using an Ethernet cable and USB Ethernet adapter at the same time?
What would happen on using an Ethernet cable connected to one network and
then plugging in another Ethernet cable but using an USB Ethernet adapter from a
different network.
Would it connect to both ...
1
vote
1answer
25 views
How do devices with static IP behave themselves when plugged to a new network? [closed]
I'm trying to understand how to determine if a device plugged to my PC with Ethernet cable has a static IP.
What I'm trying to do is to sniff DHCP packets that it sends and by looking at DHCPDISCOVER ...
0
votes
0answers
16 views
IP SLA Flow generator (udp-jitter)
I study IP SLA because i want to test my network for VoIP. I found an article who show a study of " Scalability of Layer 3 Tunneling Protocols: Case of Voice Traffic Over IP".
"Based on this project ...
2
votes
2answers
49 views
ACL: Deny specific host not working
I'm trying to create an acl for use with a nat but I can't get the deny statements working.
All hosts on a private network should be accessible, except from a server which should not be accessible ...
5
votes
2answers
155 views
How to architect a globally distributed website, from an IP address perspective
I would like to have a website that is loaded fast from any point in the world. From my understanding, you need to take advantage of the data center "regions" at places like Google Cloud or AWS. That'...
1
vote
2answers
73 views
How does cellular data differ from an ISP, and what can be tracked?
Are IP addresses given to a phone static or not?
Also, how can phone companies keep track of a person if they wanted to find them? For example, I don't have an account and use a pre-paid card.
I'm ...
2
votes
3answers
76 views
Is it possible that two servers were configured with the same ip under the same switch
I have two physical servers, their configuration as following:
ServerI:
IPADDR=10.1.1.5
NETMASk=255.255.255.0
ServerII:
IPADDR=10.1.1.5 (Same IP)
NETMASk=255.255.0.0 (different NETMASK)
Because of ...
3
votes
1answer
79 views
Public and Private IPs
I wondered if someone could explain this to me.
At work we have a firewall that connects to the Internet and has an external IP configured on it via DHCP. The firewall's WAN port connects to an ...
-1
votes
1answer
28 views
why can't we use the sequence number to distinguish them since every packet has a different sequence number? [closed]
It is a question from Networking stanford course.
A server typically listens for TCP connections on a particular port
(e.g. 80 for HTTP or 22 for SSH). Which fields can the server use to
...
0
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0answers
21 views
Which fields can the server use to distinguish packets for a particular client connection? [duplicate]
A server typically listens for TCP connections on a particular port (e.g. 80 for HTTP or 22 for SSH). Which fields can the server use to distinguish packets for a particular client connection?It is a ...
0
votes
0answers
20 views
Unable to calculate for subnet mask [duplicate]
My question is - To divide a class C network into a maximum of 14 subnets each capable of having up to 14 hosts, the subnet mask used should be .. what and how ?
0
votes
0answers
20 views
Questions about IP addresses [duplicate]
So, I have to research IP addresses, and there are a couple of things I don't quite understand. In my test there will be questions like 'Which of those IP-addresses is private' or 'which of those is a ...
1
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2answers
44 views
Does an IP address with host part zero's represent a network, or a network interface in a network?
If the host part of a IPv4 address is all zero (e.g. 192.168.1.0 in a network with mask 255.255.255.0), does the address represent the network, or a network interface in the network?
Thanks.
2
votes
1answer
43 views
IHL(Internet Header Length) field is 4 bit long and specifies the header length in 32 bit words. What does it mean?
I am trying to understand IPv4. I cannot understand
0
votes
3answers
59 views
What IP address can't be the source address in a packet?
I heard that the destination address in a packet can't be 0.0.0.0.
Is there any IP address (including special ones) which can't be the source address in a packet?
Thanks.
7
votes
2answers
910 views
Why do IPv6 unique local addresses have to have a /48 prefix?
According to RFC 4193, unique local addresses will always have a prefix of FD00::/8.. but according to Wikipedia:
The block fd00::/8 is defined for /48 prefixes, formed by setting the forty least-...
0
votes
2answers
34 views
what does the flag and mtu means in here
Reading some logs from my system it states
eth0: flags 4163 < up, broadcast, running, multicast> mtu
I am not sure what is the meaning of the flag here
down below I see eth1,2,3 has the same flag ...
2
votes
1answer
41 views
What can an IP address be assigned to?
What can an IP address be assigned to?
A network interface, which is what I thought originally. (I seem to hear a network interface can have multiple IP addresses assigned to it, and if it is true, ...
11
votes
3answers
1k views
Are the IPv6 address space and IPv4 address space completely disjoint?
Tanenbaum's Computer Networks says
Finally, IPv4 addresses can be written as a pair of colons and an old dotted
decimal number, for example:
::192.31.20.46
Does it mean the IPv4 address space ...
1
vote
1answer
29 views
Public IP addresses on cloud platforms [closed]
My question is about cloud platforms like AWS or Azure. Whenever we create an instance (VM or VPC), AWS allocates a set of public and private IPs for that instance.
Now the number of user accounts (...
1
vote
1answer
77 views
Switch Configuration for Connecting LAN and WAN
Totally new on networking and on switches, so excuse me if I use some wrong terminology.
Problem
I have 1 computer and 7 instruments. I would like to form a network setup fulfilling the following ...
7
votes
2answers
2k views
What is IP squat space
I came across this article and I'm trying to understand what is going on here, I found some packets on my network containing 22.0.0.0/8 and 29.0.0.0/8 IP range and It's based on:
https://en.wikipedia....
3
votes
1answer
74 views
Host IP address vs gateway IP address vs DHCP IP address
What is the difference between a host IP address, a gateway IP address, and a DHCP IP address when setting up networking devices?
For example, when configuring a virtual network adapter for my VM, I ...
1
vote
2answers
32 views
How does a router know it's received an OLSR message?
So I'm working on my own routing protocol based on a alternative to IP, called ILNP, and I'm having trouble understanding how a router differentiates control packets and data packets for OLSR.
The IP ...
3
votes
1answer
175 views
What happens if the IP MTU is smaller than the MSS?
Let's say i configure the MSS > IP MTU. Even if it doesn't make sense, would this be possible?
Assuming i then try to send a file of the size of MSS or bigger, the network layer will receive the data ...
2
votes
1answer
40 views
IPv4 only host on a dual stack environment
I am looking into migrating to IPv6 at my company. Our plan is to dual-stack everything for now, however, we have a couple of local servers that are IPv4 capable only. The rest of our network will be ...
