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The picture below sums up my home network. I have two routers and want to split things up a bit (I have my reasons and don't want an access point). I'm a data guy and not a network guy so apologies ahead of time for what may be a trivial question.
Without the static routes, computers hooked up to router 'B' were able to get out to the internet, but I want computers on Router 'A' to be able to communicate to computers attached router 'B' (and vice versa). With the static routes on each router, I still couldn't communicate from A --> B, but only when I added routes on the computer themselves (Mix of Ubuntu and Windows) could I get it to work.
Example: Computer on 'A' needed a route to 192.168.2.0/24 via 192.168.1.10 to be able to ping the computer on 192.168.2.x, though it was able to ping the gateway (192.168.2.1) prior to the route addition.
NOTE: Router 'A' is a TPlink and Router 'B' is an Engenius (with only 1 port, no lan/wan option)
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We have been using Linphone for our calling services and its working fine on wifi and almost every cellular network except the one with iPV6 infrastructure.
The problem we discovered with iPV6 environment is that our signalling ip changes very frequently and as a result our call drops after 30 seconds timeout.
Any guide regarding this matter will be helpful.
Thats happens often on 5G network.
You can do nothing here, it is not related to asterisk, it is related to how 5G providers handle NAT. The do not care.
Only thing you can do is use android/apple push mechanism to force your application to re-register with new IP.
You can do nothing if customer change GSM cells while in call. Except maybe issue re-invite, but that is really hard and I know no softphone which do that correctly.
Another option is to use tunnel with ping inside it/resetup(or setup ignore source IP for tunnel) and put your sip traffic inside tunnel. But that WILL eat battery a lot and customer will complain or uninstall your app.
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I can't wrap my head around routing tables. Is it true that every router has a table with routes to every ip address in the world? Wouldn't that make the tables huge and thus make the lookup slow?
Routers with few interfaces need only few entries - a home router with a single subnet inside and the Internet outside just requires two entries.
Routing is a distributed job, every router only needs to know the routes it's got connected somewhere. Hops more remote to the final destination might only match a very short prefix - the default route with /0, or maybe /8 or /12 specific routes. The closer a hop is to the destination, the more refined (=longer prefix) the route is likely to get, with a prefix of /24, /29 or even /32.
The more interfaces, subnets and thus choices a router has got, the longer the routing table gets. Internet core routers may have many 100,000 to more than a million routing entries (thx Ron). More powerful routers use special, content-addressable memory (TCAM) to enable single-step lookup.
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I am studying networking and operating systems and I stumbled upon this statement:
If there is no default gateway in the routing table we can't transfer packets to all the addresses.
I am asking whether the above statement is correct?
Yes the statement is true. Here is the definition from wikipedia
A default gateway in computer networking is the node that is assumed
to know how to forward packets on to other networks. Typically, in a
TCP/IP network, nodes such as servers, workstations and network
devices each have a defined default route setting, (pointing to the
default gateway), defining where to send packets for IP addresses for
which they can determine no specific route.
A routing table can not store information of all the possible routes to which the computer may connect. So it needs a default mechanism to send traffic to computers for which no known path exists. The way is to route all such packets to default gateway.
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I have a small doubt regarding the LAN as i Havesome pcs in my office i want to connect them internally with the little cable connection but i don't want to use any internet activity from them.(purpose is the share the data internally and no use of internet).
And i have some more selected people who want to use the internet access so i want to give some special access for internet for that selected laptops.
Iam a kid in networks as i don't have any idea how i can start and move with the project suggestions are mostly accepted
You can do the following :-
Establish a small LAN connection in your office which will consist of those selected PC's which are not intended to run internet at all! You can simply establish LAN connection using routers and switches! Then,develop a small web-server like thing on one of the PC's which will work as server and the rest will work like clients! You can simply set up a distributed server which will take care of synchronisation things too(but, that is not advisable for a basic OR a newbie)!
But, simply multiple-clients and a server is what you need to
establish using LAN connection for and make network file-sharing access permissions for all the systems... There are several softwares to transfer files and internally communicate like a small mail-server intended for OS like Windows,Linux,etc.
Next for those laptops which you wanna connect to internet---please establish a source of internet like any ISP and so! Next,a gain establish a small LAN connection among those PC's which you want to connect to internet to. That's it,VOILA!
Next step of yours would be simply to configure DNS setting,IP-Address of the ISP,Subnet Mask and Gateway and that is damn easy. You simply need to add it to the router settings through which all of your systems,which are intended to access internet,would be connected. If you want to achieve the first thing with these PC's, then simply establish a local web-server or mail server for file transfer or mails,etc. locally within the office.
Another possibility :-
Establish the web server communication with all the PC's connected. Connect all the PC's and laptop to router's and switches as desired. Keep a note of IP-Address of all the PC's and laptops. Now, install a web-filter/firewall which will restrict users from accessing internet based on their hostname & IP-Address. Remember for this to take place, all the systems must have static IP-Address allocation,not the DHCP configuration!
I guess these are some of the possible steps. But,there can be several effective steps too...
Best wishes from my side!
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I have recently added a dlink router to my existing network, and connected some computers with it. The existing network uses ip range 192.168.1.x and the new router uses 192.168.0.x. Internet services is accessible on both the networks, but a shared resource or a web server connected to one network is not accessible to the systems of other network.
I googled this issue but I am unable to resolve the issue, please help.
If you are just going to be using the router as a switch on an existing network, you need to turn off its router-y features.
Go onto the web interface of the device and turn of "NAT", that way they'll use the same address space as everything else on the network.
They'll be other features as well you may want to turn off but that's one causing your current issue.