Questions tagged [networking]

For questions about networking in general. Any question about all on topic network devices can use this tag.

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How can a IP under a VLAN communicate other VLAN's IP?

I have a network topology as below: I want to use the Server0 to manage(communicate) to 10.10.10.1-3. you know the 10.10.10.1-3 are vlan100's SVI. there have vlan 100 and vlan 501. IP programme: ...
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1answer
271 views

When server has 2 NIC, device from one network can't ping another [closed]

I've successfully completed the network design and everything worked just fine until I tried to ping the computer on the edge. Well, Master server "sees" the connections on both lines, but when I try ...
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1answer
26 views

Why do baseband transmissions use TDM?

To the best of my knowledge, baseband transmissions use (only) time division multiplexing. Why is that so? TDM isn't as efficient as statistical multiplexing. Why is TDM preferred for baseband ...
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1answer
99 views

Sequence numbers and wrap around concept

I was reading an article about the topic and I came across this :"During connection establishment each party uses a Random number generator to create initial sequence number (ISN), which is ...
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2answers
25 views

why sometimes we need to use Broadband Transmission (Using Modulation)?

I was reading a textbook which says: Baseband transmission requires that we have a low-pass channel, a channel with a bandwidth that starts from zero. This is the case if we have a dedicated medium(...
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1answer
70 views

How my neighbour machines in the same network knows my interface ip?

In my local machine if I set the IP address to an interface, how other machines know this and route the packets to me if anyone tries to send packets to my new IP? I am in a private network.
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1answer
492 views

Crossover Cabling - Reversing TX and RX Signals [duplicate]

It is often said that crossover cables 'reverse the transmit and receive signals' compared to straight through cables. However I am yet to see an actual explanation of why the reversal of signals is ...
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1answer
34 views

Is it possible to query interface statistics bytes by given start time to end time in Juniper Device?

I can query a interface detail: admin@Juniper-EX# run show interfaces ge-0/0/1 detail Physical interface: ge-0/0/1, Enabled, Physical link is Down Interface index: 131, SNMP ifIndex: 504, ...
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1answer
46 views

What is benefit of allocating ASN to edge routers and not Ip addresses

What is benefit of allocating ASN to edge routers and not Ip addresses ? I mean we could have given these edge routers unique public ip addresses too ?
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1answer
68 views

Are these two private subnets completely isolated from each other?

Im trying to set up a subnet address range in my local network but the private address ranges of 172.16.1.1 192.168.1.1 10.1.10.1 are all already being used. So I was wondering, if I make this ...
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136 views

Route between two routers

This is the topology I'm working with. I'm able to ping from VPC_LAN_Ato VPC_LAN_B and trying now to ping from those lans to Router_2_Cisco. Here are the configurations for these 4 devices: ...
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1answer
596 views

How to change AD on Juniper router?

I have this route on my Juniper Router and some destinations have two routes: OSPF and BGP. I want to change the administrative distance for the BGP route so that it will be smaller than the OSPF ...
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1answer
42 views

How to aggregate four upstream ports in the network module?

Using SuperMicro network module, which related to Intel SDN product, the command PDF . and the Web GUI manual. there I have qe57, qe61, qe65, qe69 four upstream ports, I want to aggregate them. how ...
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1answer
274 views

The number of nodes in a fat tree topology

To my knowledge from papers I have read, the number of pods is the main parameter used to determine the number of switches at each level along with the number of nodes. For instance, in each pod/k in ...
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1answer
610 views

Finding the source MAC address in Router Advertisements [closed]

What is the source MAC address in the Router Advertisement packets received on the interface eth1? -i have ran tcpdump -i eth1 and tcpdump -n -i eth0 icmp6 -ifconfig eth1 and tried using the HWaddr ...
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1answer
41 views

For ethernet with bandwidth B, how much time a node has to wait before sensing the channel after the first collision detected?

Let's say one node detected a collision at t=0, in B Mbps ethernet, how long will that node wait before sensing the channel again?
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2answers
40 views

How to add hot swapping feature in network traffic? [closed]

Background: Assume I have PC1 communicate with PC2. Another PC3 connects (in serial) between PC1 and PC2 and inspects their network traffic (like a firewall hardware). If PC3 shut down for some ...
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2answers
22 views

Why Ping Reply Succcess from different subnet IPs

In the university lab, i manually added IP in two ubuntu machines. PC1 IP 10.129.2.33 255.255.0.0 and PC2 IP 10.129.2.165 255.255.255.0. I connected first both computers with direct ethernet cable ...
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1answer
28 views

What is the difference between these two different network security devices?

I have a choice between these two network security appliances, however the only difference I can see is the year and I don't know what that year means. SONICWALL TZ300 WIRELESS-AC SECURE UPGRADE PLUS ...
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2answers
14 views

Network Cable Flow Rate vs Propagation Speed

I was reading about network Cables then I saw some information that made me feel confused for example : if we say have a we have copper wire (e.g. Twisted pair) that can achieve a flow rate of 10 Mbps ...
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1answer
27 views

Connect two places 400 meters away at 10 Gigabit

we are a small media company with 10 gigabit networking using a couple Netgear Switches and CAT6 Ethernet to all the computers in our office. We expanded to a new location recently which is around 400 ...
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1answer
31 views

Are there broadcast/collision domains on non-Ethernet networks?

What if we have routers or hosts connected via ATM, Frame Relay, or SONET; that is, what if we have IP over SONET, IP over ATM, IP over Frame Relay, etc., do we still have broadcast domains and ...
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1answer
20 views

Is an extra port opened when accessing localhost:port? [closed]

Imagine a program serves "Hello World" on localhost port 6000. If I visit localhost:6000 in Chrome, is an intermediate port opened to send back the response? From the POV of the server, the ...
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2answers
68 views

Congestion control in transport and network layers in TCP/IP

Why do we need congestion control in BOTH the transport layer and network layer in TCP/IP model. Cant we be good enough with control in just one of the layers only? And how do they differ?
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78 views

Why does IPv6 NS not use unicast address but multicast

This is a follow up of Why not put unicast address in IPv6 packet containing NDP neighbor solicitation instead of solicited-node multicast address? The accepted answer makes no sense. It states the ...
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1answer
136 views

How do I properly serialize a network packet [closed]

So I'm currently writing a program that is essentially just a server and a client. The idea is that I want them to be able to communicate with one and other by sending packets back and forth. And I'm ...
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1answer
33 views

confused with transmission delay

I was reading a textbook which says: The transmission delay the amount of time required to push (that is, transmit) all of the packet’s bits into the link. Does it mean that transmission delay is ...
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2answers
53 views

Layer 2 managed switch and layer 3 switch

If you have layer 2 managed switches which have VLAN's on them, do you still need a layer 3 switch/router?
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1answer
56 views

How to identify Digi CM Console Server via command line/SSH?

Digi CM Console Server is a Secure Access and Management for Servers and Network Devices https://www.digi.com/products/networking/infrastructure-management/console-servers/digicm#overview How do we ...
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1answer
132 views

iperf3 UDP tuning

I am trying to test throughput in the network. But when i start iperf3 client for sending UDP packets it sends TCP SYN packets. Why does it behave like this? (it should not send udp tcp syn while ...
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1answer
346 views

Is it possible to setup IPsec behind NAT without port forwarding?

We want to setup a IPsec connection between customer sites and our office so we can manage the hardware we place at customer sites (e.g. barriers). Its important that the VPN connection stays up all ...
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2answers
91 views

Modify the IP in TCP/IP packet

My ip address is specified in the ip packet sent to the next node. I wonder if a device that handles this packet can modify the ip address before forwarding it to the final destination? In theory ...
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2answers
54 views

Best way to make a network failsafe?

I have a Debian based machine with 2 completely different network interfaces from 2 different ISPs acting as a backup for my server connection. These have two different IPs (Let's say IP1 and ...
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2answers
30 views

Will TCP packets smaller than the full bandwidth of its link travel at the same speed?

If I send 5bytes over a 1mbps connection will that travel faster than 500bytes. Or is the latency after propagation going to be constant since the packet is under 1mb? If you downvote because you ...
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2answers
494 views

Fiber dBm transceiver power level at warning

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following. Question: what is the normal power level for ...
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4answers
131 views

setting up a VLAN and joining 2 buildings through underground cabling

I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd. So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
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1answer
187 views

How is the MD5 hash calculated in BGP?

The RFC is very superficial on the implementation details. What is the injective function being used? https://tools.ietf.org/html/rfc2385 MD5 digest is produced by applying the MD5 algorithm to ...
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1answer
731 views

Connecting a 10 Gig server to a 1 Gig switch

Recently we purchased 5 servers. It has 4 10GB ports + 1 1GB Management port, as follow: 4x 10GB ports per server (2x traffic, 2x ISCSI), and (1x 1GB management port) However, we are trying to see if ...
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2answers
86 views

What's the “routing-instance” in networking?

When I read this Article: there is a term routing-instance, how to understand this term?
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3answers
210 views

How to find out which port is located on a switch physically

I'm trying to physically located a port on a switch. I know which port the mac address is connected to. The port is Gi2/0/14. But this is part of a stack. How do I know which switch this port belongs ...
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1answer
41 views

Suitable Laptops

Not sure if this topic or question has been asked before but if I was to buy a 2019 top spec macbook pro, would instill be able to connect to Cisco devices, I'll be running windows on it as well but ...
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1answer
26 views

Strict source routing using my own scattered PCs/ routers

I would like to completely control my network transportation by defining the packages path. According to this I can't do it unless I have control over all the PCs/ routers in its way. Suppose, I can ...
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1answer
24 views

Router Extended Access Control List

Why can't we place the Extended ACL close to the destination not the source ? What will happen if we do so ?
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1answer
832 views

POE negotiation between IEEE PD and the POE Switch?

I know that there happens a negotiation between the IEEE PD devices and directly connected POE Switch through CDP or LLDP protocols. But if for some unknown reasons, if the CDP/LLDP is disabled on the ...
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2answers
501 views

Different MAC addresses [closed]

What happens if a host on the network receives an IP packet with a MAC source address that differs from the MAC address in the local ARP table for that source IP. The ARP table entry for that IP was ...
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2answers
921 views

Mac address table ,packet tracer

I connected two pcs to a switch in packet tracer , no ip addresses at all.and on switch cli I put a show mac address-table command,why there is nothing shown in the table?how does the switch so learn ...
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1answer
56 views

Bringing two different hosts each in two different subnets into a same subnet [duplicate]

Physical Network: 11.11.10.0(mask:255.255.248) Subnet A 1 :11.11.10.0 IP A: 11.11.10.4 (mask:255.255.248 and 6 hosts) Subnet B 2 :11.11.10.8 IP B: 11.11.10.11(mask:255.255.248 and 6 hosts) Hi ...
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1answer
57 views

Why does this setup fail sometimes with Juniper EX4200?

I've got a very straight forward setup with the following devices: 1 x 10G Fibre uplink (internet) 1 x ASUS AC68U wifi router 1 x EX4200 20 x Servers (With IPMI and single ethernet) The EX4200 is ...
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1answer
26 views

Sending Frames Among Routers needs MACs?

Following this discussion: ARP request outside of LAN; Target machine or router response? I'd like to understand if router 1 sends its frames to router 2 through the same ARP process as discussed ...
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2answers
59 views

should phy layer and mac layer be designed together?

I have a question about the independence of the layers. I know that the layers in protocol stack are designed in a way to be independent from each other. I want to know does it mean also that we can ...

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