Tag Info

Hot answers tagged

33

Latency is generally independent of bandwidth. Latency, as commonly measured by ping times, is an indication of how long it takes for your system to send data to another computer and to receive its response. Latency is influenced primarily by how far the data must travel—it takes much longer to access a webpage on a server that is halfway around the world ...


22

You can use freely any Private Network Address. http://en.wikipedia.org/wiki/Private_network RANGE 10.0.0.0 -- 10.255.255.255 172.16.0.0 -- 172.31.255.255 192.168.0.0 -- 192.168.255.255 Refer to RFC 1918 for background Keep in mind the Network address and Broadcast Network: http://en.wikipedia.org/wiki/Host_address ...


12

You can use netstat for this. See the example (I grepped for ssh): netstat -putan | grep ssh tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1725/sshd tcp 0 0 1.2.3.4:45734 1.2.3.5:22 ESTABLISHED 2491/ssh tcp6 0 0 :::22 :::* LISTEN ...


12

For the most part what you listed is all you need to do for basic functionality. There is however one more thing you could do, you could check the X-Forwarded-For header added by some proxies (the kind used for caching) and load balancers and report that address instead because the address you get from the source address will be the proxies address, not ...


7

…and the previous IT personnel did not leave any information. I feel your pain on this. Inheriting someone else’s unmapped and undocumented network mess is not pleasant. As explained in this answer you could use nmap like this; of course 192.168.0.1/24 is an example and should be changed to the network range assigned to the system by the ISP: nmap -sP ...


6

That is pretty much it. The source IP address of the request is part of the packet that contains the query. For example, here's a CGI script written in Perl that prints back the IP address, and as you can see, there's not much to it: #!/usr/bin/perl use strict; use warnings; use CGI qw(:standard); print header(); print ...


5

Consider how latency and bandwidth works with hard-copies carried by foot. Say you have a boxful of hard copies—about as much as you can carry without being significantly slowed down by the weight, and two places you might want to bring it, one 50 m away and one .5 km away. Let's say you walk at about 5km/h. It would take you 1.2 minutes to bring the box ...


5

In short the general rule of thumb is no the DHCP server will not know about this Static IP and if hands that same IP out to another device you will have an IP conflict which can take both devices offline. You have a two options really: Check what the DHCP scope is and make sure your static IP is outside of that scope for example if your device hands out ...


5

TCP and HTTP are different things. TCP is the transport layer. By definition, it's responsible for carrying application layer protocols (HTTP in your case) over it. TCP does not run over a port. It is the arbitrator of ports. In other words, when you connect to an HTTP server, you connect on TCP port 80. When you connect to HTTPS, you're connecting ...


5

If I understand your question correctly, I might rephrase it as, "If the network infrastructure allows HTTP traffic to pass on a certain port, will it also allow pure TCP (without full HTTP-compliant operation or even fake HTTP headers) to pass on that port?" Unfortunately, the answer is, "It depends on details you have not yet discovered regarding how the ...


5

The 192.168.1.1 IP address used by many home routers is an IANA-reserved private network address or subnet. What's a subnet? An entire range of IP addresses that you can split up into a smaller ranger (the act of splitting it up is called subnetting) if you want. So the above range is 192.168.0.0/16. Keeping it simple without getting too much into the ...


4

Loopback is special. It's the entire 127.0.0.0/8 space, and it never leaves the machine. That is the only exception to listening for only configured addresses, if it's on loopback it's special. I can't think of any security implications to that, since those addresses can never be on the physical network.


4

Another tool that can do this is lsof: # lsof -i -a -p 1981 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 1981 root 3u IPv4 917 0t0 TCP host.example.com:ssh (LISTEN) # lsof -i -a -p 1981 -n COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 1981 root 3u IPv4 917 0t0 TCP 10.1.2.3:ssh (LISTEN) # lsof -i ...


4

It depends on what you're using the cable for. If you're using it for any flavor of Ethernet (10/100/1000BASE-T), then Yes, it makes a difference for signal integrity. Ethernet uses differential signaling, where a signal waveform is sent down one wire of each pair, and the inverse of that signal is sent down the other wire of that pair. Because the two ...


4

A typical consumer router has three different network interfaces: WAN LAN Wireless LAN Each of these interface has its own MAC address.


3

The problem with the length and bitrate is closely related to the way how bits are represented. The following description is valid for basic amplitude modulation that applies to your proposal of "sending bits through a cable". As @sawdust points out in the comment below, modern networks do things rather differently [1]. Ones and zeros are expressed by ...


3

The authoritative DNS servers for your domain name are not reachable over IPv6. You should talk to your domainname-provider and ask them to make the DNS servers available over IPv6.


3

IP needed to be easily implemented on a wide variety of hardware. CPUs of the day didn't have CRC32 hardware built in. No one was expecting to create custom hardware for IP compatibility; IP was expected to be handled in software. So they had to select something that could be easily implemented in software on systems that were already in the field in 1981 ...


3

The accepted answer is not quite correct. Actually you may be able to connect all 3 it if the router with the wifi has an ethernet WAN port not just and ADSL port. Many do now have that because a lot of high-speed broadband is now presented via a residential gateway or pure ADSL modem. My Billion 7800N does for example. In that case, you would connect the ...


3

Private MAC addresses are often found in embedded systems that do not have an official address. Many cheap "credit card computers" such as the Raspberry Pi must generate their own address to operate without an official, manufacturer-assigned address. For you interest: Private MAC addresses can be identified by having the second-least-significant bit of the ...


3

Access points belong to the data-link layer (layer 2) devices. An access point cannot create a new network. It only broadcasts whatever packet it receives...just like switches. A router is a good example of a device that can create a new network.


3

If both the modem and the Raspberry Pi are on the same logical network (e.g. no NAT or routing is involved) then your Raspberry Pi cannot act as a gateway, because it is inside the only network available, and the actual gateway is your modem. This is the case if your modem has an address (say 192.168.1.1/24) and your RPi/computers an address in the same ...


3

As already noted, telnet uses only 1 port as it's interactive/terminal usage. Ftp set's up two communication channels - control and data. This means that the data channel is independent from control [interactive] comms. Moreover, control channel uses Telnet proto (RFC): The Relationship between FTP and Telnet: The FTP uses the Telnet protocol on ...


2

Ping is designed to show the time it takes for a packet to traverse a network to any given computer system and send back a reply. In it's most basic form, it simply indicates time in millisseconds to receive a response from any host that you are attempting to communicate with. There is a very large amount of information on the web documenting the use of ...


2

In some networks , there are some hosts that need to have fixed IPs addresses , say for example : a server , printer...etc which will facilitate the access to them for users and applications , and in order for your network to use the Dynamic Host Configuration Protocol (DHCP) which attribute IPS to hosts) and for those fixed hosts to use a fixed IP , there ...


2

"DHCP address reservation" specifically means that the router will always offer the given address whenever the host asks for one using the DHCP auto-configuration protocol. However, only DHCP offers were made static, but the router's IP→MAC neighbour cache (aka the ARP cache) is still filled in dynamically using ARP. Meaning, if you bypass DHCP and ...


2

I wrote a tutorial a while ago on SMTP auth on Postfix. The source can be found on http://blog.mtak.nl/2013/04/simple-smtp-auth-on-postfix/ . TLS Whenever you send a password over the network it ought to be encrypted. Add the following parameters to your main.cf to enable TLS: # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem ...


2

There is nothing unusual in these findings. You can have multiple A records for a DNS entry, as in the first example. You can have a single one as in the second and third examples. You would generally have multiple IPs where you have a site hosted by multiple servers. The results are all equal priority so people will resolve to a different server each ...


2

Firstly expand the advanced options and change promiscuous mode to allow all so you will be able to pass the traffic. Secondly you will need to set up manually IP address, subnet and the gateway for each machine. In your Kali machine you can do it by opening terminal console: vim /etc/network/interfaces and in your XP machine go to your local area ...


2

Does your computer have a physical NIC? If so, simply remove the network interface card. If it's integrated into the motherboard, go into your Device Manager, go to Network Adapter, right click, and select "Disable." This will disable the network interface and will not allow any incoming/outgoing network traffic. This solution isn't PERMANENT, however. To ...



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