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.
0
votes
1answer
11 views
How do devices with static IP behave themselves when plugged to a new network? [on hold]
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
13 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
39 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
112 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
50 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 ...
3
votes
3answers
72 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
74 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
25 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
votes
0answers
18 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
vote
2answers
27 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.
1
vote
1answer
20 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
55 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.
5
votes
2answers
793 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
31 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 ...
1
vote
1answer
37 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, ...
10
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 ...
0
votes
1answer
26 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
64 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....
2
votes
1answer
54 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 ...
0
votes
2answers
29 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
67 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 ...
1
vote
1answer
35 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 ...
0
votes
1answer
46 views
OSI Model vs Network Model: Does It Matter Which One You Use?
The OSI (Open Systems Interconnection) model is comprised of the following layers:
7. Application Layer
6. Presentation Layer
5. Session Layer
4. Transport Layer
3. Network Layer
2. Data Link ...
1
vote
1answer
35 views
Where is the block which caused IPV4 client can not access IPV6 Server
I read many documents which are saying if you are in IPV4 network then you can not access IPV6 network, for example when I was at home I can not access some IPV6 website, such as:ipv6test.google.com.
...
6
votes
2answers
2k views
Why maximum length of IP, TCP, UDP packet is not suit?
From many tutorials, I get follow knowledge(maybe I'm misunderstood) :
maximum of an Ethernet packet is about 1500 bytes.
maximum of an IP packet is about 65535 bytes.
maximum of a UDP packet is ...
0
votes
0answers
14 views
Why maximum length of IP、TCP、UDP packet is not suit? [duplicate]
From many tutorials, I get follow knowledge(maybe I'm misunderstood) :
maximum of an Ethernet packet is about 1500bytes.
maximum of an IP packet is about 65535bytes.
maximum of a UDP packet is 65515 ...
3
votes
1answer
42 views
ip dhcp class command
Here is a DHCP configuration that we have here:
ip dhcp class range
ip dhcp pool abc
network 10.10.10.0 255.255.255.0
default-router ...
class range
address range 10.10.10.10 10.10.10.254
My ...
6
votes
4answers
1k views
Does every host on the LAN share the same ARP table, or do hosts keep them individually?
I'm just learning about ARP. I'm a little bit confused. My confusion is better explained in a scenario.
Host A is communicating with Host B. Host A knows Host B's IP address, but not it's MAC address....
6
votes
2answers
913 views
How do routers on the backbone avoid IP address conflicts?
As the title suggests, how do ISPs, and other networks connected to the backbone ensure that their host network address isn't already in use by another backbone node, as there is no controlling device ...
4
votes
1answer
345 views
Will the packet be dropped when the number of hops equals to default TTL?
From my understanding, the default TTL represents the maximum number of hops allowed such that the packet may reach the host.
NTP Documentation Archive: ttl - This option is used only with ...
19
votes
2answers
5k views
What is the difference between 0.0.0.0 and a loopback IP address?
From the book Computer Network:
The IP address 0.0.0.0, the lowest address, is used by hosts when they
are being booted. It means ‘‘this network’’ or ‘‘this host.’’
... All addresses of the ...
1
vote
3answers
84 views
Is an IP address assigned only to something with a Mac address?
From https://en.wikipedia.org/wiki/IP_address
An Internet Protocol address (IP address) is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol ...
6
votes
1answer
1k views
Dealing with IP Spoofing
Border routers, which are routers that span two or more sub networks,
can be configured to block packets from outside their administrative
domain that have source addresses from inside that domain....
2
votes
2answers
73 views
How does a router know the destination mac?
so if I send a packet from a host to another from the same network we know the mac address of both the source and destination.
However if the receiver is in a remote network the destination mac ...
2
votes
1answer
44 views
Can mobile devices take a global IPv6 address by means of only routing?
I'm probably asking this the wrong way, but here it is; I have a /48 block with static addresses for every device on the network. Everything is routed, no NAT, no tricks.
My question is: on a mobile ...
3
votes
3answers
105 views
Is it possible to perform a Layer 2 (MAC address) traceroute?
I understand the difference between layer2 & layer3 and MAC & IP. I understand address resolution protocol, etc. But is there any way to do a traceroute that will show Layer 2 information? For ...
-1
votes
1answer
42 views
Network IP questions [duplicate]
Suppose I have a network with IP address 192.168.10.1/16.
This network can hold up to 65536 machines, from 192.168.0.0 up to 192.168.255.255 (65534 machines without the network ID and broadcast ...
0
votes
2answers
76 views
Why we need ARP when each device has its own IP address?
I don't really understand Address Resolution Protocol (ARP). Why we need ARP when each device has its own IP address?
2
votes
1answer
38 views
Why aren't we encrypting data on Network level instead of transport level when using e.g. HTTP [closed]
Why we are bothering to encrypt our data on a transport level, instead of just doing that on a network level with e.g. IPSec and get rid of the need to to that in upper layers. For example instead of ...
0
votes
0answers
20 views
Why are there only ~4 billion IP address available? [duplicate]
I am new to networking, so I apologize is this question is naive. I understand that 2^32 = ~4 billion. However, if you add in subnet masks, won't this number increase? For example, let's say you have ...
0
votes
1answer
40 views
Usable IP addresses and MPLS
I work at a company where I am partly responsible for IT, just because I'm semi technical and we're not big enough to warrant a dedicated role for someone else. I was asked to look into upgrading out ...
-1
votes
1answer
55 views
Classifying IP address [duplicate]
I need to decide if the IP address 130.192.0.0 is a host or network address and which class it belongs to (A/B/C).
I've read about the different ranges that the different classes have of IP ...
2
votes
2answers
297 views
Cisco 899G-LTE Cellular 0 interface in spoofing mode
I have a problem. After I've reseted my router configuration it doesn't get IP from LTE SIM card.
Seems like my celullar0 interface is in spoofing mode.
> Router#show interfaces cellular 0 ...
-1
votes
2answers
139 views
Is IP address starting with 115. public or private?
I have one device with ip address 115.124.114.111. I want to know if IP address starting with 115. public or private?
1
vote
1answer
40 views
Exclude 10.63.128.0 10.63.255.255 or 10.63.128.0/17 range from 10.0.0.0/10
Please help to suggest a method to exclude IP range 10.63.128.0 10.63.255.255 from 10.0.0.0/10.
I have a access list 3100 to filter the traffic with rule 10 10.0.0.0 0.63.255.255 and now I have to ...
0
votes
1answer
54 views
Finding the IP address of a Cisco 3750G
Hello i have a Cisco 3750G switch and i need to find the IP address and I dont have a serial cable, so I need the IP address to login into the web-interface. Does it need to be connected to a network? ...
0
votes
0answers
18 views
DHCP Broadcast messages [duplicate]
Why are there so many DHCP broadcast messages while trying to give a computer some network settings?
2.Last,when can these broadcasts be avoided and how are DHCP relay agents related to the whole ...
