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.
969
questions
0
votes
0
answers
21
views
Web design and layout [closed]
In our network design, can a wireless link be achieved through two routers? If so, how should it be arranged?
The two routers cannot link. I want to connect two routers to achieve network ...
0
votes
1
answer
52
views
Layer 3 Switch IP Problem on Packet Tracer
I set up a network. It contains vlans. I assigned devices ip addresses from different subnets. I have 2 layer 3 switches to communicate them. I assigned switches ip addresses from different subnet. I ...
- 3
0
votes
1
answer
36
views
Simple question about NAT [duplicate]
So I am learning about NAT. I understand that it changes IP from public>private and vice versa. From my understanding, when a packet or info gets sent to the public ip towards the private ip, ...
0
votes
1
answer
83
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
No access to internet via DHCP, but works with manual IPs
My DHCP server was giving out IPs in the range 10.0.0.1/24, but I ran out of usable IPs, so I changed the subnet to 10.0.1/21 to have more available addresses, however I am now having a weird problem:
...
- 133
0
votes
2
answers
43
views
Advertising IP prefixes to the internet using BGP
I am studying BGP at the moment.
From what I've learned, in order to participate in routing on the internet and use BGP, we need to register a public provider-independent IP address block and a public ...
- 759
1
vote
1
answer
33
views
RIP v2 Network Command
I am comparing the Boson ExSim Lab to the Neil Anderson's Lab on RIP.
On one of the labs on Boson ExSim, it asks to configure RIP on the routers, all of which are on some form of a 192.168..0.0/24 ...
- 11
0
votes
1
answer
32
views
What does "Configure kernels to not follow the RFC 5681 SHOULD" mean?
Netflix documentary The Playlist about Spotify, they present one of the technical breakthroughs that they created their own TCP implementation to reduce the latency from first click to playing the ...
- 101
0
votes
1
answer
39
views
How to prevent a user from using YouTube while connected to my network [closed]
i need to restrick specific user from using youtube and other socialmedia during job time
- 1
1
vote
1
answer
216
views
Understanding IPv4 model of operation
I'm new to networking and reading RFC791 about IP protocol specification and got some question regarding the paragraph 2.2 Model of Operation. Here is what is discribed:
The internet module prepares a ...
- 121
0
votes
1
answer
99
views
IP and Ethernet endianness
I'm completely new to the topic, I've read that Ethernet sends Bytes in a Big-Endian way, but that bits are sent with Little-Endian. I've also read that IPv4 uses Big_endian order. So my question is, ...
- 1
0
votes
1
answer
39
views
Recognizing the next protocol in MPLS header
How can I know what is the next protocol in MPLS header?
I do know that MPLS header does not provide any information about the next protocol,
But I somehow need to know how to recognize it, as I am ...
0
votes
2
answers
70
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
113
views
Why Linux answers ARP requests for IPs that belong to different network interfaces? [closed]
My machine has a physical network interface (eno1) and a bunch of virtual network interfaces (e.g. tap0). Each interface has its own IP and their subnets do not overlap.
I noticed that if I perform an ...
- 103
0
votes
0
answers
6
views
How does each OSI layer get to know the information [duplicate]
This might sound dumb but how do each layer get the information?
To give a context,
Lets say I enter www.google.com, the browser sends a request to the Application layer and then the HTTPs request is ...
- 395
1
vote
2
answers
58
views
How did ATM switches that were implemented in a core of IP network improve QoS and higher data rate?
How can ATM switch improve Quality of service and data rate just by incorporating them into the core of IP network? What was used in the sore of IP networks before ATM switches and what is used today ...
1
vote
2
answers
159
views
How does subnetting solve the problem of IPv4 address shortage?
Reading articles on the web, they all say that "subnetting solves the problem of IPv4 address shortage by dividing a large physical network into multiple smaller networks". I do not ...
- 135
1
vote
1
answer
49
views
Why does a PIM DM assert loser reply with a prune?
In PIM Dense Mode, why does an Assert loser send a Prune message to the winner? What is the actual motivation for this?
- 183
0
votes
1
answer
356
views
Not able to ping device with different subnet on gateway and ip adress
I am trying to ping a device with IP 192.168.0.200, subnet mask 255.255.255.0. It is configured with gateway adress 192.168.1.1.
Is it because the gateway subnet, and ip adress subnet is different i ...
- 1
1
vote
0
answers
22
views
What are the triggers for PIM-DM prune and assert messages?
There are articles explaining the PIM-DM mechanics, and they only confused me. Considering the most common topology, that of three routers, connected to each other like a triangle as such:
R1 -- R2
\ ...
- 183
0
votes
2
answers
37
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
1
answer
447
views
Sharing same IP address inside LAN? [duplicate]
Q: if 2 devices A and B share same ip address in LAN, can device A retrive all messages whose destination is device B?
I think this depends on how the LAN is configured.
If it's wireless then device A ...
- 1
0
votes
1
answer
229
views
The relationship between IP address and AS number
I've recently been looking for the IP prefixes originating from a specific AS. And there are a few questions I'd like to get confirmed.
We can register IP addresses and ASN from RIR. But where can we ...
- 9
0
votes
2
answers
149
views
Connecting L3 and L2 switches with VLAN settings
I have 1 L3 switch with
Static ip - 192.168.0.252
Two L2 switches
Switch A - 192.168.0.250
Switch B - 192.168.0.251
I have created VLANs in L3 switches with 192.168.1.1 and 192.168.2.2 ips abd set it ...
- 101
0
votes
0
answers
20
views
In multicast, do shared trees exist solely to reduce router processing of (S,G) forwarding states?
I am asking this question strictly at a conceptual level. I am not asking from a specific protocol's standpoint.
Why do shared trees exist in multicast routing? What was the reasoning behind them?
...
- 183
0
votes
1
answer
21
views
Detect the use of a VPN connection _to_ a box by traffic coming _from_ the box [closed]
Imagine that we have three boxes:
A <--(VPN)--> B <--(public internet)--> C
A and B are connected via a VPN. B and C are connected via the public internet.
Let's assume that A and B run ...
- 103
0
votes
1
answer
32
views
Can anyone explain what the numbers at the top of this IP Header diagram represent?
… and what is the significance of the grouping?
many thanks!
0
votes
1
answer
97
views
What are all the reasons for using a separate /31 subnet for a p2p link?
For example in this LAN, the 13.65 and 13.66 are a separate subnet between slip and bsdi, but what is the reason that they have a separate subnet?
The only reason i can think of is that bsdi cant have ...
1
vote
3
answers
220
views
How to obtain a range of IPv4 or IPv6 addresses as an individual
I am building a hobby service that can host user's containerized applications on request. These must be publicly accessible. After some googling I came to conclusion that there is no way around having ...
- 11
1
vote
0
answers
15
views
How to specify the address of the host in IPv4? [duplicate]
Lets say the IPv4 address is: 192.168.50.112 /26 which provides 4 subnets
subnet mask: 255.255.255.192
network address 192.168.50.64/26
There are 6 bits left for the Host, how do you specify the host ...
- 11
0
votes
1
answer
77
views
ICMP error message's data for IP datagram with < 64 bits payload?
RFC792:
The internet header plus the first 64 bits of the original
datagram's data. This data is used by the host to match the
message to the appropriate process. If a higher level protocol
uses ...
- 111
1
vote
0
answers
25
views
Complicated bridge between 2 servers [closed]
I have 3 servers:
comp_a, comp_b, comp_c
comp_a ([eth0 «10.15.14.55»]) 10.0.0.0/8 <———> comp_b ([eth0 «10.15.27.61», eth1 «10.15.26.61»] [eth1 «10.15.26.61» ]) <——VPN IPS (left = 10.15.0.0/16 ...
- 11
5
votes
2
answers
420
views
What does 'moving packets away from the source' in RPF means?
I recently started studying multicast and I am a bit confused by how reverse path forwarding is explained.
Most of the sources describe RPF as 'moving packets away from the source' but I understand ...
- 183
0
votes
1
answer
207
views
trying to ping 192.168.2.2 from 192.168.1.1 pcs
im trying to ping pc2 from pc0 and it doesn't work
can anyone help tell me why?
pc0 is 192.168.1.1/24 and pc2 is 192.168.2.2/24.
The port connecting switch 0 is 192.168.1.100/24 and the port ...
1
vote
2
answers
175
views
Are the IP protocols contained in the Protocol Field in IPv4 header, chronologically assigned by date of creation?
when looking at this list here https://en.wikipedia.org/wiki/List_of_IP_protocol_numbers
I see IPv6 was given #41, or 0x29.
But there are many protocols after #41. Are these other protocols assigned ...
- 123
1
vote
2
answers
284
views
routing table What does this mean (brackets in routing table)?
Sorry I couldn't be clearer. I literally don't know the terminology for it. So not only can I not describe it, but I cannot google it either because I dont know the words for it.
See photo:
Help me ...
- 11
0
votes
1
answer
71
views
How to correctly setup a DHCP server in the following network?
So, I've got the following Network Configuration:
Assume that, on the graph, "PCs" can be any device that needs an IP(apart from a router).
Now, as explained on my title, I want to run a ...
- 1
1
vote
2
answers
77
views
How ARP works [Specific Case]?
After reading about ARP and NAT I'm really confused about putting them to work together.
Let's suppose we have a router A with a public IP of IP(A). Plus, 2 devices behind that router B and C, each ...
- 13
1
vote
1
answer
38
views
Why do we need DNS? [closed]
The case for DNS usually goes like this: People like names. Computers like numbers. So we let people use domain names and use DSN to convert them to IP numbers and everybody is happy.
But IP numbers, ...
- 111
1
vote
0
answers
24
views
Landlines and IP Phones [closed]
The video I am watching mentions the following information
I always thought of these traditional/landline phones as an old technology that is not used anymore, but this was just from a home's ...
- 759
0
votes
2
answers
66
views
Could we use an IP address in our network that does not fall into the RFC 1918 range?
RFC 1918 specifies 3 ranges of IP addresses as private
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
So in a real network, only these IP addresses could be used? What if I assigned a host on the network an ...
- 759
0
votes
0
answers
4
views
How does a device learn the IP address of another device? [duplicate]
I am working on network systems. There's something I want to talk to you about. I started my research with the question of how a device learns the MAC address of another device. As far as I understand,...
- 1
0
votes
1
answer
98
views
Are encapsulation and decapsulation really happening inside an operating system?
I have read in many tutorials that Encapsulation is when the data go down the OSI model or the TCP/IP model and a header is added to it at each layer, and Decapsulation is when the data+headers go up ...
3
votes
1
answer
206
views
Does the MSS (Maximum Segment Size) prevent IP Fragmentation in all cases?
I have read that the MSS (Maximum Segment Size) is used to prevent IP Fragmentation.
Now if the two communicating devices exist on the same network, and this network have a MTU (Maximum Transmission ...
- 229
2
votes
1
answer
53
views
What does "direct-attached networks" mean?
This page says the following:
TCP controls this maximum size, known as Maximum Segment Size (MSS),
for each TCP connection. For direct-attached networks, TCP computes
the MSS by using the MTU size of ...
- 229
3
votes
3
answers
795
views
Can you send data in LAN without an IP?
From What I know, IPs are used to communicate b/w two different networks say LAN1 and LAN2... and MACs are used to communicate within a LAN.. I think this because my instructor says that Hubs and ...
- 51
5
votes
2
answers
444
views
Does the IP header have a "Padding" field?
I found two images of the IP header, one image shows a field called "Padding", while the other image don't show the "Padding" field:
Which one of these two images is correct?
- 229
0
votes
1
answer
58
views
Packet tracer help with routing between multiple company routers with vlans and wireless routers
Im still quite a novice to packet tracer (so im sorry if this has been answered) and I'm trying to ping both vlans at company1 router to both Lans at company2 router but for some reason when the ...
- 3
2
votes
1
answer
383
views
How CIDR helped to slow down routing table growth?
Besides allowing for a greater number of ip addressed, Classless Interdomain Routing (CIDR) was also intended to slowdown routing table growth in core routers.[1] I may understand how it expands the ...
- 21
0
votes
1
answer
46
views
Relation between the BACnet 4 layers and the TCP/IP 5 layers
How are the BACnet 4 layers (physical, data link, network, application),
related to the TCP/IP 5 layers (physical, data link, network, transport, application)?
Are they separate of them, or build on ...
- 103