0
votes
1answer
139 views

Source and Destination Packets on Wireshark Relative or Absolute?

New in Packet Analysis. Sniffing on the Ethernet device of my computer. Does the Source and Destination columns on Wireshark tell the source and destination from where the packet was originated and ...
7
votes
1answer
3k views

How do I poll the ARP table with an SNMP OID?

When you need to poll the ARP table of a device, conventional wisdom is to use ipNetToMediaPhysAddress or atPhysAddress; however, both of these OIDs are deprecated according to Cisco's documentation. ...
1
vote
2answers
327 views

Is TCP/IP encapsulation MSB or LSB?

Application data sent over TCP experiences multiple encapsulations: The application data is encapsulated within one or many TCP fragments The TCP fragment is encapsulated within one or many IP ...
1
vote
2answers
1k views

What is the difference between flow control and congestion control at layer 2 and 3? [closed]

Is there a difference between flow control and congestion control at the following layers? layer 2(data link layer) layer 3(network layer) If they are not same, then how is each handled at the ...
-2
votes
4answers
7k views

What happens when ARP Request comes from a different subnet?

What will happen when an ARP Request packet is sent from router1 to router2 in the following two cases? Will an ARP Reply be generated or the ARP Request packet be dropped? ...
1
vote
1answer
409 views

What is the effect of stale ARP cache entry on traffic to that DIP till the entry ages out of the ARP table?

If the host, for which an ARP table entry is present on the connected router, has changed its NIC(so that its MAC address has changed), what will happen when a packet is sent out on the link with the ...
7
votes
1answer
686 views

Can a limited broadcast packet contain destination MAC address other than FF:FF:FF:FF:FF:FF?

Can a limited broadcast contain destination MAC address other than FF:FF:FF:FF:FF:FF? If the answer is true, could you provide an example of a protocol that uses a packet like this. Ok, to elaborate ...
4
votes
5answers
514 views

Share one IP address with a simple router

We have just moved into a new office and have been given our 'internet connection' in the following form: One Ethernet cable in the corner of the room An IP address with subnet mask 255.255.255.0 ...
2
votes
2answers
594 views

Ethernet over IP

I need to merge two L2 broadcast domain into single domain and I have to do this over unmanaged by me L3 IP network. All that I could find is vtun utility for linux. Which software&howto you can ...
0
votes
1answer
213 views

How to identify device and its IP on network by MAC on Ubuntu 10.04+?

I have a NAS (LinkStation Mini). Its windows software identifies it correctly. I want to identify device and its IP and mount the same.
1
vote
1answer
412 views

Hardware won't respond to each others ARP requests

I have two pieces of hardware (embedded devices) that I have setup to communicate via TCP over Ethernet in a client/server fashion. The topology of the network is as follows: ----- | S ||=|== Debug ...
1
vote
1answer
163 views

Which cloud services allow layer 2 link level connections between servers?

There are advantages when you can deploy one server A so that it serves as the IP gateway for machines B, C, and D. In a real machine room, for example, A can balance incoming customer connections by ...
1
vote
1answer
2k views

Why didn't my Linux server start with an active network connection?

I booted my Linux server today via WOL. When it came up, I couldn't SSH onto it. I checked the server and it had booted into the OS but wasn't reachable on the network. I checked my router which ...
2
votes
2answers
2k views

what should be the destination MAC address for a limited broadcast address(255.255.255.255)

configuration: host(H1-10.10.10.55/24) has a default gateway(g1) 10.10.10.1/24. Question 1:H1 sends a packet to 255.255.255.255. What should be the destination MAC address in the outgoing frame? ...
2
votes
4answers
471 views

2 servers cannot see each other in internal subnet (192.168.1.10)

I have a few servers in one rack. They all have 2 network interfaces eth0 and eth1. On all, eth0 has a public IP address assigned which works well. I'm setting up a private subnet on the second eth1 ...
1
vote
2answers
7k views

How to ping eth0 from eth1 on my linux machine?

I have a linux machine with 2 ethernet ports(eth0 and eth1). eth0 is connected to a router which assigns it an IP address 192.168.1.2. eth1 is connected to a switch which doesn't have an IP. How do I ...
0
votes
1answer
883 views

ubuntu network interfaces config

I had many ip-s routed to my dedicated server. Interfaces file look like this auto lo iface lo inet loopback auto eth0 iface eth0 inet static address xx.xx.xx.xx netmask 255.255.255.xx gateway ...
0
votes
2answers
60 views

How to reply some request from which routes its came from?

I wonder if we can reply some request from which route its came from? My Situation is like this: eth0 192.168.10.1 --> gw: 192.168.10.254 nm: 24 eth1 192.168.11.1 --> gw: 192.168.11.254 nm: 24 ...
0
votes
1answer
269 views

What's a typical turn-around / response-time for this query/reply scenario?

I'm doing a feasibility study on a proposed wireless/wired network topology for a coming project of ours. A rough description of its use is "like an industrial sensor system". It looks something like ...
1
vote
4answers
4k views

How does a host route IP packets if it gets two IP addresses?

To clarify my question... I am wondering how does the Linux kernel route packets on a multi-home host? With 'multi-home', I mean the host has multiple NICs to send packets, for example my Debian in ...
0
votes
1answer
94 views

COTS T1 over Ethernet/IP solution?

I am looking into a low cost solution to run a T1 link over ethernet, I found this one: http://www.rad-direct.com/Product-TDMoverIP-Gateway-IPMUX11.htm $1500 for the link. Anoyne else have other ...
7
votes
7answers
15k views

Is it possible to match an internal IP address to a switch port?

I'm trying to find a computer that has a certain IP address on our internal network. I have identified the computer name from DNS, but in this case it does not help me. Just wondering if I can ...