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589 ip questions.

I have a very simple topology, where 4 routers use IPV6 and RIP, there aren't problems and all devices have connectivity. The issue is if I add another router this time using IPV4 for clients. I ...

I've been learning about networks recently at a new job, and I did a presentation on what I've learnt so far. When I was describing the relationship between the datalink and network layer, I mentioned ...

I know ICMP uses IP datagrams to reply to echo requests but what is above that?

Ultimately what I want to do is connect a second physically separate gateway, and assign its WAN port one of the public IP addresses given by our ISP. So I have the following setup currently and is ...

Network Diagram for IPv6 LAN

1 answers, 439 views ip ipv6 lan
From what I understand about IPv6 networks, since NAT was a hack to deal with a lack of IP addresses in IPv4, NAT is a possibility, but not a requirement in an IPv6 LAN. So taking this into account,...

As I understand it, when Host Alice knows Host Bob's IPv6 address but not its MAC, Alice sends an NDP Neighbor Solicitation (NS) message to the solicited-node multicast address for Bob. Alice knows ...

Smallest IPv6 block advertised?

1 answers, 2.024 views ip ipv6
We've received a /48 allocation from ARIN, and want to advertise smaller blocks from different sites in our organization. I tried advertising a /56 from each site, but ISP is telling me they won't ...

We are currently building a networking course with a practical part where students have to configure a small network in a virtual environment. However, we are not sure what ipv6 prefixes we can use ...

I have an IP address 12.23.34.22 I need to find the network prefix for this IP Address. For that I need to find the subnet mask and then count the number of contiguous 1s to get the network prefix. ...

I am currently in college learning about networks, and I just wanted to sure I understood part of the TCP correctly. The question is "What does TCP use to reassemble packets in the correct order?" ...

If a TCP packet is fragmented then would the identification field of the header stay the same for all of the fragmented packets, or would it increment by 1 so that the receiver would know what packet ...

Let’s say I have 4 ethernet interfaces getting IP addresses via DHCP. I make a TCP connection to a TCP server via one of the IP addresses on a certain ethernet interface. After the connection is ...

I want to connect wireless camera to a local network. The wireless camera's range in line of sight is 100 meter. if i'm creating a local network using my phone (hotspot) which gives range 30 meter ...

There is some .pcap-file with fragmented ip traffic. I replay this file with tcpreplay. Also for specific testing purposes I need to replay it with DF (don't fragment) bit set in some packets. I ...

I understand that we are running out (or ran out already?) of IPv4 addresses, but I don't really understand why that is. Right now, every home has its own IPv4 address (dynamically assigned, but still,...

Example: IP: 128.42.5.4 In binary: 10000000 00101010 00000101 00000100 Subnet: 255.255.248.0 How could you determine the prefix, network, subnet, and host numbers?

hi I don't know how to reach the pc 3 from pc 1 this is my situation This is not linux , this is network engineering question and just simply ask to pro for fix it. THIS IS A NETWORK PROBLEM , AND ...

Ohai guys. I have a question regarding a setup and as a fresh trainee I am having problems since there is barely any information on the internet let alone a similar case. The current setup: 2 ...

Cisco IP phones [closed]

0 answers, 13 views cisco ip
There are 10 Floors in building A, each all having meeting rooms with Cisco IP phones, I’ve set them all to be configured with the default IP and all the phones work on every floor except floor 5, so ...

I'm doing a Linux Networking homework course and I'm stuck on a question. `Your device "item2" is connected to the network. With a network ip of 192.168.1.0 and netmask of 255.255.255.0, what is the ...

My question is about CNAME and A records. As far as I know, CNAME(Canonical Name) simply points a domain/subdomain to another domain/subdomain. For example, www.foo.com -> foo.com Also, A(...

I am looking for some info on how VPN's (Virtual Private Network) forward network traffic through its VPS (Virtual Private Server). Take an example where you are connected to a VPN. You make a ...

I know that it's possible to whitelist/blacklist IP addresses (for example, only allowing a few external IP addresses to be contacted from within a VPN). But since IP address destinations are the ...

Quick question regarding static vs dynamic allocation of IP addresses. I understand that in static IP addressing the address does not change while in dynamic addressing it could differ each time a new ...

The network topology is router A and router B are directly connected with IP addresses configured on their physical interfaces int gig 0/0/1 and gig0/0/2. The third interface gig0/0/3 is configured as ...

Trace the IP address

5 answers, 70 views ip ipv4
I have created a web application using Django. While running someone entered the admin login and deleted the users. when checked in the access log of Nginx we found the IP address that actually did ...

I was reading DHCP ( RFC 2131 ), I have basic knowledge about Relay Agent and Broadcasting. But for Understanding DHCP in depth, I felt like I have to know Broadcasting and Relay Agent ( RFC 1542 ) in ...

Similar (but different) question: Assign an IP address based on switch port I regularly need to test our hardware products. Usually that consists of having ~50 devices sitting on a bench for some ...

Consider the Longest Prefix Matching (LPM) mechanism that routers use to decide which data link the packet should be sent next. Assuming that the router tables don't change, shouldn't the path the ...

Is it possible that my user-space application using the UNIX sockets API would receive an UDP packet that would have the IP TTL value equal to zero, or is it the case that it always has to be one or ...

If an error on a packet occurs on a router, who does detect the error, IP checksum or TCP checksum? I have understood that the ipv4 checksum detects errors only inside the ip header and the tcp ...

I am trying to understand the addressing strategies. But there is something which I can't grasp. Maybe I am missing a very basic point, if so, I am sorry beforehand. From my researches, let's say, if ...

I learned that in a connection, when the packet arrives at the server, the server will need all the info from the 5-tuple to determine which application will get the package, namely source ip, source ...

I understand that one reason we use SNAT on a load balancer for incoming requests is so that the response packet from server will go through the load balancer, where the source IP of returning packet ...

Today, my company got a new copy machine. During configuration, copy machine guy asked me what IP address we want to use for the copy machine. I said, "I'm gonna reserve 192.168.1.200 in DHCP ...

IPSec in IPv4 and IPv6

2 answers, 1.780 views ipv4 ip ipv6 ipsec
I'm getting a little confused in understanding the differences in IPSec in IPv4 and IPv6... Are the principles of IPsec the same in v6, but instead of it being optional it is now mandatory for it to ...

1) If I buy a new computer, I haven't connected to the internet yet, don't I have ip address? 2) if I get the ip in one county, IANA gives me the ip depends on my location (first numbers), if I ...

Say for example, you have an IP address with a CIDR prefix of /27 (mask of 255.255.255.224) and are required to create 4 subnets each with an equal amount of usable host addresses, would it be ...

When data from the application layer pass to transport layer: data may be fragmented into pieces of data, and then the transport layer will be added to the transport layer header (may be TCP header, ...

I understand the differences between LAN and WAN addresses. My question is: while outside a network, how do you target a specific machine's address beneath a public IP? Since a public IP for each ...

Today when I read a book, there is a sentence: Data in the Network Access Layer(TCP/IP's layer 1/4), it will be break up into smaller units. I can not understand this statement, does it mean the ...

Hi I'm a newbie in networking, I just want to know how IP datagram know its upper layer protocol is TCP or UDP? I know there is protocol field inside the IP datagram header that can tell the layer ...

You see, in my local Mac's network interface there is no 172.18.1.*: $ ifconfig lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP&...

Does IP provide QoS or not?

1 answers, 1.092 views ipv4 ip ipv6 qos
IP provides a best-effort delivery service. I believe this implies, among other things, that it offers no QoS to the users. However, IP has a byte in its headers (ToS in v4 and Trafic Class in v6) ...

When I connect a device to my router, or if I use a tool like Advanced IP Scanner to look for devices on my network, the found devices are typically listed with and IP and a hostname. On Windows the ...

Let us say, I want a website only I can access using its dedicated IP address. I don't want a domain name. Is it possible to host the website without acquiring a domain name?

This problem comes from Tannanebaum's CN book and the full description of it is as follows: A large number of consecutive IP addresses are available starting at 198.16.0.0. Suppose that four ...

Hi I'm a newbie in Networking, still confused about some basic concepts. If given a picture below: My questions is: Let's say node C wants to send a datagram to node A but node C doesn't know node A'...

Does anyone know whether it is possible to remotely change the mgmt IP, vlan and default gw of a HP Switch without losing connectivity when connecting via ssh to said IP? Create new (mgmt) vlan ...

If I have been assigned the address 164.12.130.0/23 in a network block. What is the maximum number of subnets that can be defined? What will be the IP addresses of those subnets. This is not a Home ...

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