when a router sends a ip packet, does it attach its own ip address to this packet?
930905
NO, considering the router is not generating the packets (source), routers never change the source and the destination addresses in IP packets, except for Network Address Translation (NAT).\n\nRouters send packets to each other by setting correct data link layer addresses—for example, MAC addresses for Ethernet or Data Link Connection Identifier (DLCI) for Frame Relay—in the data link frames or just pushing them through point-to-point links, using associated encapsulation mechanisms. If they changed the source and destination IP addresses, routers would lose information about where the packets were coming from and going to.\n\nWhen a packet is received, the router checks its validity and determines whether the packet must be delivered locally—it is addressed to the router itself—or forwarded further. If the packet must be forwarded, the router makes the routing decision and determines the outbound interface and the IP address of the router that should be the next hop in the path, if the destination network is not directly attached.
462305
It is not a site, it is the IP address of your router.
911448
Yes actually it does. Each ISP purchases "blocks" of IP addresses that they give out to the people that buy their service. The IP address of your computer may not change because it is getting an IP address from the router, modem, etc. But the IP address that is registered in your name online will be changed. Though you may not actually see it.
193017
ISPs assign IP addresses to it's customers generally in two of fowllowing ways.\n\n1> Static Address : Static Address is permenantly assigned to you interaccount, whenever you login on the net you have same IP address which is assigned to you by your ISP\n\n2> Dynamic Address : As the term refers, there is high probability that your IP address is different everytime you log in, In this case your ISP assigns IP address "As they are available" without any preference\n\nSo answer is quite clear if you have static IP then you have to call your ISP & tell them to change your IP & obviousely this method is tracable.\n\nBut if your IP address is dynamic then it changes dynamically, but at a time there is only one unique IP on the net so if somebody wants to dig deep he can find your IP\n\n If you want to hide your IP from any particular site/application/person then you can use PROXY address while communication to it.\n\nProxy Server Tutorial : http://compnetworking.about.com/cs/proxyservers/a/proxyservers.htm\n\nProxy List : http://www.samair.ru/proxy/\n\nHope you find it helpful
486682
Well it should not do that but if it dose. Go start run type CMD. Than type ipconfig /all. See what is your IP address, SubNet Mask, Default Gateway, and your DNS. Copy them on the paper. Than right click on My Network Places and go properties. Than right click on Local Area Connection and go properties. Double click on TCP/IP, click on use following IP address, and fill in what is on your paper. It will keep your IP address.\n\nTo explain Y because your network card for some reason dose not wake up automatic. All you have to do than is try to replace the network card, or first reinstall the drivers for it.
1056701
If you are running Windows XP, click Start, Run..., and type in cmd in the dialog box that appears.  This will open a DOS session.  Type ipconfig at the command prompt that appears on the screen and press <Enter> key.  You will get a few lines of results, one of them being your IP addr.\n\nNow, if you have a router between you and and your cable or DSL connection, then the IP address you see is what the router is assigning to your computer.  The outside world cannot see that address - they see the address your service provider has assigned to your router.
511166
As long as your ISP is providing DHCP service and your workstations are set up for DHCP, the default router configuration should handle everything for you. If your ISP is not providing DHCP then you will have to manually set up your internet DNS and gateway information on your router. Your router should then handle the DHCP from there.
708214
When an IP device needs to speak to another IP device on the same subnet it must have the hardware address of that device.  To get it, it looks in its ARP table (which is empty at first).  Finding nothing, it sends a broadcast ARP request saying "would the owner of the IP address a.b.c.d please respond to me?"  The all stations on the subnet hear the request and the owner responds "this is me."  (The packet with the response carries the hardware address of the responder.)  The original requester caches that association of IP address and hardware address in its ARP table.\n\nThe next time the requester wants to send a packet to the same IP address, it would find the IP address-hardware address association in the ARP table and would skip the broadcast message.  It can send the packet without re-doing the address resolution because it already "knows" from the ARP table.\n\nARP entries age out of the table after a few minutes or if another device with that IP address (and a different hardware address) speaks up.  This was if you shut down a computer, replace the network card (changing the hardware address), and re-start, the other devices on the network will learn to know your computer by the new hardware address when they want to send packets to you.\n\nThe ARP tables cut the number of broadcast network packets dramatically (every station has to receive and decide what to do with each broadcast packet).  Without the ARP table, every packet sent would be proceeded by a broadcast packet and a response from the receiver--three packets for every one effective transmitted packet.
925871
you probably changed them to something your ISP does not understand.  You should be accepting the DHCP information from the ISP to make it work properly not setting your own.  If you ISP gave you a static address then you  have to use what they sent you.  Making up your own or randomly picking things will not work.
392821
It is a DSL connection that is automatically assigned an IP address by the ISP (internet service provider).
110724
egads...#1-wrong, #2-wrong.\n\n\n#1 "...The computers behind your router use non-routable IP address, for example, 192.168.0.9..."\n\nthe local IP's are certainly routable, they are just not exposed to the Public internet as that IP.\n\n#2 "...ISPs usually block the ports that FTP and web servers use. You may need to use a port other that 21..."\n\nSOME ISP's may block that port, far more do not, than do in my experience. \n\nto answer the question, the software you installed seems to be aquiring another IP address from the DHCP server in your router, let it.  Setup 'port forwarding' in your router to forward traffic on port 21 to go to THAT IP address.\nNOTE: you will likely not be able to access FTP resources from the PC the 'server' is installed on, unless you disable the 'port fowarding'....
61727
I wonder what "IP number" you mean -- the IP address you are using when you connect to the Internet, or the IP address of a point elsewhere, such as a website?\n\nOr maybe you are just trying to connect to your wireless router and set up your own network?\n\n"Linksys routers, for example, use 192.168.1.1 for their internal IP address. D-Link and Netgear routers typically use 192.168.0.1. Some US Robotics routers use 192.168.123.254, and some SMC routers use 192.168.2.1."
34860
Depending on the context, the source IP is the originating IP or your IP.  Sounds like you are talking about a firewall set up.
209277
Kinda, sorta, no, yes.\n\nSome computers have fixed IP addresses.  For example, in a corporate network a computer may have a permanently assigned address.  One or more employees may use this computer.  So, in this case, the IP address might match to a specific user.\n\nTake the case of a home user with a high-speed connection via DSL or cable modem.  Say that the home user connects a router to the cable modem. The router assigns, via DHCP, IP addresses to a few computers in the house. In this case, the ISP most likely assigns an IP address to the home user's router.  This IP address is somewhat stable but may change during a period of a few days to several weeks.  From your viewpoint, any computer in that household LAN would have the same IP but that IP may move to a different household over time.\n\nWorst case for you would be a user with a dial-up connection.  In this case, the IP address is a modem in a modem pool.  A large group of users will share this modem pool.  So, a range of IP addresses will correspond to a bunch of users.  But, it will be hard for you to make any sense of IP addresses and users.
499141
...this is a toughy, but i would initially guess that the problem is with dhcp assignments... is the router using dhcp?
651196
if any computer is connected with a network , it cant have same IP address of any other computer in same network. So , as Internet is a big network , two computers connected to internet cant have same IP address (provided they are not connected using any proxy). \n\nTwo computers connected to there own networks (not same) can have same IP address, but if they are in same network they cant have. \n\nUsually what you see as IP address of your computer is not always the same what your ISP provider uses it to connect to Internet. Some times they use a different address for your computer to connect it to Internet. You can check your IP address using http://whatismyip.com/ , dont get surprised if it is different than what you get using IPconfig command.
375712
Socket PORT...... IP of the destination.......