Tag Info

Hot answers tagged

19

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 ...


3

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 ...


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

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

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

In your hosts file, you have both a IPv4 and a IPv6 resolution. Most operating systems today will prefer IPv6 if available. Since localhost is working and 127.0.0.1 is not, this could be your problem. There are two things I would check in this case: Check to see if the server/service is running only on IPv6. If so, change it so it is running on both ...


2

I can think of a few ways.. Give the network card a manual IP address that is completely off the network. Disable the IPV4 option of the network card. If wifi, then just do not enter the network key when prompted AFTER you remove the saved config info form Network and Sharing Center.. Manage Wireless Networks and removing your wifi from there. Hope this ...


1

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 ...


1

Sawtooth shaped ping time graphs for Wi-Fi devices can be caused by 802.11 power save mode. You probably won't see the sawtooth if you set the ping interval to a tenth of a second instead of once per second. Note that the issue I'm talking about is benign. It only happens when you have very little traffic going on, like once-per-second pings. A real web ...


1

knockd links against libpcap so that it can watch traffic on the wire similarly to any other sniffer like tcpdump or wireshark. This happens at level before iptables DROP rules (which integrate with the IP stack) are able to apply. This is why knockd can see the incoming traffic, and if you ran tcpdump instead it would also be able to see the traffic. ...


1

Alright I managed to do it. I added an iptable rule on my linux server: iptables -t nat -A OUTPUT -d [external ip] -p all -j DNAT --to-destination [server local ip]


1

No you can't change gateway per-application. (at least none that I know of) But if your router supports, you can perform QoS on certain applications you want to give preferences. I've worked with something like that long time ago and you should find it under administration section of your router configuration application.


1

Connection tracking is already recording things about the tracked connections, like whether one connection is related to another (such as a new FTP DATA connection being related to an existing FTP session, even though it's on a different port.) The conntrack iptables extension provides additional criteria you can use in iptables rules to match the tracked ...


1

Yes, you would be OK using .2.x, and that would not cause any problems, however make sure your netmask is set to 255.255.255.0 and not 255.255.0.0 because it would try to mix your .2.x with your vpn .1.x as if it was the same network.


1

You need to set up some sort of NAT or forwarding on server A. On Linux you could do that using iptables, but that wouldn't be very simple. A simple alternative is using rinetd. The configuration consists of a single line: # bind ip port destination ip port 206.125.69.81 801 1.2.3.4 801 This will work for all TCP-based protocols, I don't ...


1

The issue is that the next hope or gateway in routes need to be on the same network as the one you are connected to. ie. you can set your default route to use 192.168.11.18. In turn that system will then know how to get to the 172.16.x.x network.


1

We cannot say IP address are not used to communicate between LAN, because IP address are used to find MAC address. Inside a LAN, a switch will be used where MAC address play a vital role to find destination address.


1

The fact that you seem to have misunderstood is as follows: Within a LAN segment in a TCP/IP network, computers can communicate without using IP.  They would need some mechanism to learn each other’s MAC addresses. Computers use the Address Resolution Protocol (ARP) to learn the MAC addresses of other machines within the same LAN segment.  ...


1

Classful addressing is dead. Classes are superseded by the subnet mask. If it lets you specify a subnet mask, it's not classful.


1

Yes. Since years ago home routers allows classless addressing. Whenever you see that the router configuration interface has a field to put the subnet mask, it means that the router supports it.


1

Your router may manage this for you. Assigning the UPS a static IP on the router may add it to the lookup table on the router. Add 192.168.0.1 as the primary DNS on the configuration page you have shown. Failing that, you can edit the HOSTS file on your system If Windows, the file is at C:\Windows\System32\drivers\etc\ and you will need to assure that ...


1

FTP uses a command channel and a data channel, hence two connections are needed. Telnet connects to exactly one port - the one you tell it to. See this section on the Wikipedia page for more info


1

Telnet only uses one port because it only establishes one bidrectional stream of data between the client and the server: The data from client's keyboard (or stdin) to server, and the data from server to client's screen (or stdout). There is no need for it to ever send any "control" or "status" information. Your client connects to the telnet server, and from ...


1

you can match it from this template: I see clearly a RJ12 adn RJ45 Female Connectors.


1

Try using your default gateway 0.0.0.0


1

Either your router is not operating correctly, or your router and your computer cannot communicate. You have an "auto-configured" IP address and no gateway, which means that Windows tried to get an IP from your router, but did not get a response from your router. Try resetting your router, and double-check that the appropriate lights are on indicating that ...


1

I have run across this issue only a few times. For me what would cause the broken pipe was a missing route. It only occurred when connecting from a physical machine on the main network to a VM on a different network behind a Nat. I would check for networking issues to see if you can stop the broken pipes from occuring. If you can not find a cause for the ...



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