Tag Info

Hot answers tagged

53

Please be aware that a system can handle more than 65536 concurrent connections, because they do not necessarily each use a separate port. A TCP connection or UDP flow is defined by the 4-tuple: (source IP address, source port, destination IP address, destination port) So even if you have a web server machine with just a single IP address, and a single ...


11

I think Linux is much better to learn network administration. If you configure Linux networks, you have to know what you are doing, otherwise you won't get it work. With Windows you have a working network soon, but you don't know what you have done.... Just my two cent


7

It might be your router, but it might be your ISP: I have seen ISPs blocking all DNS (UDP 53) requests to other IPs than their DNSes - they do this to either monetize (make their DNS resolve ad-sites worng on purpose) or sometimes for legal reasons (DNS-based blocking of sites). And before you ask: Yes, they deliberately break DNS.


6

The generic name for both methods is Cascading, although the second one is sometimes more accurately called bridging. The router connected to the Internet is called the main router, while the other one is called the secondary router. Cascading or bridging can be used to extend the network's range and/or to reduce the number of devices communicating with each ...


5

Yes, use something like RDP to log into the windows server, setup something so you can access the NAS directly, and initiate the file copy/move from the server.


5

From RFC3927: An IPv4 packet whose source and/or destination address is in the 169.254/16 prefix MUST NOT be sent to any router for forwarding, and any network device receiving such a packet MUST NOT forward it, regardless of the TTL in the IPv4 header. A device with a APIPA address will not have any default gateway, and will not be ...


4

By default, your computer will use one network path to reach destinations; which ever network connection has the lowest routing metric, which on a Microsoft Windows system you can see with the route print command. You can modify that behavior by adding a specific route to a particular destination with the route add command. The syntax for the route add ...


4

Sure: ProxyCommand "~/bin/connect-via-dropbox %h %p" …where the connect-via-dropbox script would look up the IP address from your Dropbox, then connect to it using nc, socat, or ncat. For example: #!/bin/sh host=$1 port=$2 file="$HOME/Dropbox/Server IPs/$host.txt" if [ ! -s "$file" ]; then echo "error: '$file' empty or not found" >&2; ...


4

Either "it depends" or "both". If you are heading into an industry that is very Windows centric or Linux centric then concentrate on that side, otherwise you are likely to encounter both and should understand at least the basics of both thoroughly. Which ever one you concentrate on, you will at some point have to interact with the other. With regard to ...


4

You're probably wasting your time. The browser sends its request to the IP address it gets by resolving the server name using DNS. It adds the actual server name as a Host: header automatically and the web server uses the Host: header to determine which pages it should serve. If you give the browser the IP address of the server and substitute the server ...


4

What kind of service are you looking to forward? SSH would be an easy one to relay if you have an server somewhere outside. If you can access an outside SSH server, you can forward a remote port on that outside server to your internal server (and optionally have it accept outside connections). ssh -R *:12345:internal.server:22 user@public.server This ...


3

Short answer: yes you probably can in general mix ethernet-over-powerline adapters, in theory: You can mix and match Powerline adaptors running at different speeds and from different manufacturers – as long as they all support at least HomePlug AV. Naturally, faster adaptors can talk to slower ones only at the lower speed. Beware of older kits still ...


3

There are several likely scenarios as to why the problematic wifi connection is crashing your modem. Either the router has completely crashed and hardware reset itself (hence the lights go off completely) and on restart continues to reset as the laptop re-establishes wifi connection. The internet lights will not come back on green as it takes a bit of time ...


3

I ran into this problem after upgrading my server to F21 from F20. Disabling the firewall altogether let Kodi find and mount the NFS shares, but I was uneasy about having no firewall at all on the server. I've done: firewall-cmd --add-port 1024-65534/tcp --add-port 1024-65534/udp --add-port 111/tcp --add-port 111/udp Which opens up everything above the ...


3

You can try out the "dhcping" utility. On CentOS/RHEL, you'll have the option to "yum install it" after you'll gain connectivity to the EPEL repository. Check out the command options. They seem really relevant for your needs. dhcping(8) General Commands Manual dhcping(8) NAME dhcping - send a DHCP request to DHCP server ...


3

I see that the connection gets terminated by the peer, as has been pointed out in the comments on your question, which implies that it is the ISP terminating the connection. Also, this happens precisely 24 hours after the connection has been established, which suggests a forced disconnection by your ISP (a measure to ensure your IP address changes every 24 ...


3

Open a command prompt window as administrator. From there type the following command: netstat -b -a This will give you a list of all open ports and their process associated with it. If you need more information, type the following: netstat -b -a -o The -o will show the process id which you can look up in your taskmanager, processes tab, or if you ...


3

Non-encrypted FTP has the username and password sent by plaintext and is not secure. SFTP is far better but if your router does not have this capability then you're out of luck. Does your router have any VPN capability which might then offer you better security when FTP'ing to your drive? If not then, again, you're out of luck. If you want encrypted ...


3

Unencrypted FTP is just that. An attack that intercepts your data (very unlikely in “normal” countries, by the way) can read both login credentials and data transfers. SFTP is not related to FTP at all. Instead, it uses a SSH connection. As such, it’s very secure, as long as you have reasonable credentials. Like SSH, it supports public key authentication. ...


3

The first packet inside a HTTP connection (the HTTP request) or a HTTPS connection (the TLS ClientHello) are clearly distinguishable from the first packet in SSH. Encryption of HTTPS/TLS does not help here because you can detect this traffic by the initial handshake preceding the encryption. But this is not foolproof. For instance Skype tries various ...


3

Linux is more widely used I'd say. Especially if you want to go big. Network is often bundled with Servers - and Servers usually run some kind of Linux. IMHO Linux is at least better in anything with developing because it allows you to tinker. - But that's just IMHO.


3

Because Ping is a broadcast-compatible service. A computer that receives such an echo request will happily reply.


3

Firstly tell us whats the distance between these three houses. There are a number of options: Set up a fiber link between the houses as fiber goes way beyond the 100m limit of copper cables Use mesh devices between these houses equiped with strong omni directional antennas e.g. [Mesh Potatoes][1], I personally used these to create a community network with ...


2

i think , you are using kali linux in VM on any host machine (window ) . if i am right than it will not show wifi in VM . you have attached wifi device on host machine not in virtual machine. there is no wifi device attached on VM . you can access wifi in host system only . for VM(Kali machine) internet you have to do NAT , Bridge etc. that ip will show on ...


2

It sounds like from that description that you need a switch which would be plugged into the patch port in your room and then plugged into both computers. An alternative would be to get WiFi but on the Thinkpad you could either get a USB WiFi adapter or create a bridged connection between the two computers. Hope this helped


2

You can use backquote -->`<-- to substitute a command with its output Something like ssh `cat file`


2

The best way to deal with a DDoS is to start as far away from your connection as possible; you want to cut off such an attack as close to the source as possible. First, find out the IP addresses being used, whois them, and talk to the ISP on the far end. They might not be able to help if they're in a foreign country, or spread all over the world, but if ...


2

Routers/firewalls mostly come with their own default static IP address (also depending on manufacturer and model). If the IP address of your router is not within the same range as your DHCP server, you will not be able to access it. For example: your firewall has address 192.168.1.1 (subnet 255.255.255.0) and distributes 192.168.1.50 to 192.168.1.200, you ...


2

There is no legal requirement to register the location of an IP address, it is up to the owner of the block where IP addresses reside, and they can move them as needed. However, there are plenty of registries that track such things. While an individual IP address may not be recorded in terms of location, the major routers around the world have their ...


2

The router problem in your followup edit is evidence that your router is doing NAT, and doesn't support NAT hairpinning (also known as NAT loopback). This is usually a bug (or missing feature), not a configuration error, because there'd be no good reason to ever disable this if the router supported it, so it's not something you can switch on or off with a ...



Only top voted, non community-wiki answers of a minimum length are eligible