Overview: I live in an apartment, and I wish to use Cisco routers to run my network for career development. I plan to place a 40 thread server in the other bedroom because I can't run it in the same room as my current desktop because it would overload the circuit. As a result, I require a Cisco router running IOS (I want the CLI) that possesses wireless capabilities to allow my IoT devices and phones/laptops to connect to the internet. I also require another cisco router with wireless capabilities to act as a bridge to the network for the server. I will also use two cisco switches, but that is the easy part of the equation unless the routers I find also have switches inside.
Running cables isn't an option because I can't drill the walls, and I would then have to run the cables from one bedroom to the other, which is not ideal.
Problem: The problem I am finding is that there is extremely cheap cisco routing equipment on eBay, but I am unable to know if these products have the capabilities I require. Also, finding the wireless NIC card that can be inserted into these devices is not easy. Deciphering compatibility is another issue entirely.
Question: Can someone please assist me in picking my devices. I am looking to use pre-owned hardware due to cost.
ISP: Version Fios 1gb pipe.
It would be expensive to create bridge over WiFi using Cisco routers, not just cost but the expertise to make it work. You are better off getting cheap Cisco IOS routers like old 2800 or 2900 series, then use two cheap WiFi routers like TP Link for the WiFi bridge. So your setup would look something like below.
[BEDROOM DEVICES] --> CISCO RTR Ethernet --> TPLINK WIFI BRIDGE
Same on the other end as well.
Related
I am building a project utilizing Wifi on the ESP32 module. Using RTOS, I am running a web server on 1 core and a web client on another core. This works very well and I can access the web server remotely via my browser and the WiFi provided IP address. The Web client reads some sensors and sends the data via WiFi to my database. All good and everything works as desired.
Now I need to do the next step and move beyond the reach of the WiFi and reproduce the same result via 3/4G cellular. I looked at the "easy" solution to use an industrial 3/4G WiFi router and simply keep what I have. Cost of these "industrial" type routers are on the high side, where as 3/4G module which also include a GPS chip are around half or less. Problem is that I cannot get my head around how I will "replace" my current WiFi functionality with one of these modules. The modules seems to expect you to connect via serial (rs232) and using modem AT commands establish a connection to the internet. Question is, after connecting to the internet, how do you continue to have "network functionality" same as with the built-in WiFi? Is there some library that will do ethernet over the serial port? Can I still have the WiFi and the "serial ethernet" running at the same time or switch between the two?
Thanks!
I am trying to develop an application for network monitoring. A part of this application is to detect "is any wifi router connected to any switches ports".
Basically, I have a mysql database table where I have all the mac addresses of devices(pc,wifi router,..) connected to each switch port(by SNMP). As far I know, first three bytes of mac address (Organizationally Unique Identifier - OUI) represent the vendor/manufacturer of the device. So, I want to make a list of all known vendors who manufacture wifi routers (Linksys,TP-LINK,Netgear,SMC,..) and make a match with the OUI to the mac addresses stored in database.
Q1. Is the solution correct? or what would be the appropriate way to solve this problem.
It would be a great help if any one suggest me what should be the appropriate way.
Thanks in advance
No, this is not an appropriate solution. For example, macOS allows a Macintosh to act as a Wi-Fi router via the Internet Sharing feature, but its Ethernet MAC address will still just have a regular Apple vendor prefix.
As already stated by Gordon Davisson you will be missing "Internet sharing"-constructions, so your results will be incomplete (i.e. False Negatives).
Another source of False Negatives could be wireless routers using NICs from a large generic vendor (think Intel).
Besides that; the OUI will tell you what the device's vendor is, but NOT what kind of device it is. It could, for instance, be a WIRED router, leading to results which are not, in fact, wireless routers (i.e. False Positives).
The big pain in the behind for your problem is that what you are trying to detect; a (wireless) router; shields certain data-traffic from clients behind from means of identification that would aid you in your query.
i am working on a network discovery program which employs snmp to discover devices in the network. My program takes the router-ip as input, scans the iprotetable(iprouttenext hop),to determine if any other routers are connected to it. for non router devices (like switch) the algorithm scans the arptable (ipnettomediatable) of the router, but cant find the connected switch unless i ping from the switch to the router. is there any way where i can determine the device connected directly to the router ..?
Getting the devices connected to a router or switch is not that easy. Switches usually maintain a MAC forwarding database where it stores which MAC address has been seen on which switch port. This table can be easily read by using the bridge MIB. Unfortunately, there are several issues to take care of:
Those entries disappear again, when a device to the switch has been switched off or is simply not communicating. Usually, the entries in the MAC forwarding tables age out after 5 minutes or so.
The fact that a MAC address has been seen on a switch port doesn't mean that the device having the mac address is directly connected to the port. There might be any number of other switches, routers or hubs inbetween.
Some manufacturers like Cisco or HP use their own protocols to determine the network topology. There are several protocols (that area usually also available through a SNMP MIB):
CDP (Cisco Discovery Protocol): This is a proprietary protocol developed by Cisco to expose network topology information. Some vendors licensed this technology and implement that protocol in their products.
LLDP (Link Layer Discovery Protocol): A standard similar to CDP, but without paying Cisco license fees :-)
And many more. I know kthat Extreme Networks has their own protocols and I am pretty sure that other vendors have them as well.
The problem with those protocols is when you have a mixed environment. Cisco switches talking CDP do not understand Extremen Network's protocol and vica versa.
If your goal is to find IP addresses to discover, then you might use the ARP caches for routers. Scanning the ARP caches for switches makes no real sense, because they're operating on layer 2.
I was using broadcast message for my java snmp agent
I need to monitor how many smart phones are connected to a wireless network in a certain area. I found out that Zigbee can be used to accomplish this task. I need to at least differentiate each phone connected. What do I need to do?
Without knowing anything in regards to Zigbee, you could use the BSSID of the device as your unique identifier. Every WiFi radio has a unique BSSID. Just a thought.
ZigBee (802.15.4) and Wi-Fi (802.11) are different networking standards. They both use 2.4GHz, but a ZigBee radio won't be able to identify nodes on a Wi-Fi network.
Zigbee (IEEE 802.15.4) and WiFi (IEEE 802.11) are two different PHY/MAC specifications. The first thing you have to do is:
Build a gateway between the Zigbee and WiFi networks.
Each smartphone should be capable of connecting to the Zigbee network.
Each smartphone should act as end device and Zigbee controller
should track the position of each smartphone. This controller should
be connected to Wifi via gateway [1]. Then you can easily track
number of smartphones connected to a network.
As the question states, I have two ethernet devices I need to use. A wifi hotspot for general traffic as well as a LAN connection for local traffic (192.168.1.*). Right now the wifi receives all traffic and disregards the existence of my local LAN devices. I am trying to communicate with this device using python's urllib2 and basic http fetches. The program works partially when I turn one or the other off (turning wifi off makes the LAN code work, and turning LAN off makes wifi/general traffic code work). I believe this is more of an operating system issue than a programming question, but I might be mistaken. I have been messing with the Ethernet setting in system preferences, but nothing has been working so far.
Thanks for the help.
Depending on your needs and degrees of freedom, you can:
1) Easiest: If you can control one or both network ranges, you can put wifi and LAN on different subnets. For example, 192.168.2.* could be LAN traffic, and 192.168.1.* could be wifi. If only the WiFi side has a gateway, then all traffic except 2.* traffic should route through WiFi, and all 1.* traffic goes to the LAN. No change to your computer.
2) Medium: if you don't control the networks, you can define routing rules for the two ports. This lets you say certain IP addresses should be reached thru wifi, vs others thru LAN port. An example in Linux, which I think should work on OS X too: http://linux-ip.net/html/routing-tables.html The trickiest thing is to make sure you won't get in the way when you're in someone else's network. You can do this by creating narrow routing rules, or turning them off when you don't need them. It sounds like you're doing this from a python program, so maybe the program could turn this on and off at start and finish.
3) Slightly more exotic: I wasn't totally sure from your question, but if you're trying to do load balancing (not separate networks), you could create rules to bond together two network ports and spread traffic across them. This isn't something I've done, but real network engineers know how to set this stuff up.
I could expand on one of these if you clarify what you're trying to do and what degrees of freedom you have.
For somebody don't want to do the study you can simply repeat my steps:
Open system preferences
click on Network
(ensure the precedence, first thunderbolt then wifi) click on thunderbolt
Configure IPv4 choose manually
delete router
done!
I have exactly the same user case. But I read this without any network knowledge.
I achieved this by simply following #Nils' 1) instructions. I only understand theses instructions after reading this link