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  1. JasonDeckard

    Which protocol handles fragmenting more nowadays?

    I don't mean to confuse anyone, but I understood the question to be which protocol handled fragmentation. I take that to mean which protocol fragments and reassembles packets (as opposed to files), and that protocol is IP. http://www.closedsocket.com/
  2. JasonDeckard

    Which protocol handles fragmenting more nowadays?

    Pescho, Sorry for the delayed reply (I haven't been checking this board very often). The host will fragment the payload, but it will not fragment TCP packets. If I have 100k to send, my host may break those up into chunks of 8192 bytes each. Along the way, those 8k packets may be fragmented...
  3. JasonDeckard

    Which protocol handles fragmenting more nowadays?

    Hi Pescho, Fragmentation is handled by IP. Although firewalls commonly analyze TCP headers, the TCP portion of a transmission is nothing but payload to the layer 2 and 3 devices handling it. Hope that helps, Jason Deckard http://www.closedsocket.com/
  4. JasonDeckard

    IP adrress change in the registry, is it possible?

    Hello, It is possible to change your network settings through the registry. Take a look at the entries under HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Services -> Tcpip -> Interfaces. Each interface has its own settings, including IP address. Good luck, Jason Deckard...
  5. JasonDeckard

    UDP port check

    Cheerful, On many operating systems, this can be done with netstat. You can see a list of all your open ports with netstat -na from the command-line. Regards, Jason Deckard http://www.closedsocket.com/
  6. JasonDeckard

    Can't ping a particular address?

    Actually, I apologize. I shouldn't post before having my morning coffee. The 125 address is, of course, completely valid on the 172.16.136.0 network. Can you post any details about your router's configuration that might help identify the problem? http://www.closedsocket.com/
  7. JasonDeckard

    Can't ping a particular address?

    If your mask is 11111111.11111111.11111111.10000000 (255.255.255.128), the host addresses on that subnet are 10000001 - 11111110 (129 - 254, with 255 as broadcast). This might be the reason why you cannot reach 125. http://www.closedsocket.com/
  8. JasonDeckard

    can ping, can't browse

    Is it a DNS issue? Can you browse when you enter the IP address of a site instead of the domain name? http://www.closedsocket.com/
  9. JasonDeckard

    SSL Vs VPN

    Internet Explorer supports 3DES, which uses a key length of 168-bits. Also, the use of certificates in SSL is the defacto standard (the server normally identifies itself with a certificate and may request the client to do the same). There is some bad information about SSL in this thread. If...
  10. JasonDeckard

    SSL Vs VPN

    This is incorrect, as SSL is protocol independant. HTTP over SSL (HTTPS) is certainly common, but it is by no means the only way SSL or TLS can be deployed. http://www.closedsocket.com/
  11. JasonDeckard

    Localhost connected to Localhost

    Use the command netstat -o to see which process ID has the ports open, and then use the command tasklist to find out which application is associated with that process ID. http://www.closedsocket.com/
  12. JasonDeckard

    Can ping router but not www

    Just a few quick suggestions: -Check for loose cables. -Connect to the router's administration page and see if it has a WAN side address. If so, see if you can ping any other machine on that subnet. If you can, it may well be an ISP issue. -Bounce the LinkSys. I have one at home and every...
  13. JasonDeckard

    Ports question???????

    Ports allow applications to communicate over networks. People often assume to know which application is using a port based on the port number. For example, port 23 is commonly used for telnet, and port 80 is commonly used by web servers. A list of commonly used ports can be found here...
  14. JasonDeckard

    My char array is confusing me

    Guilty as charged, ArkM. One star for you to show my appreciation :) strncpy(dest, source, sizeof(dest) - 1); http://www.closedsocket.com/
  15. JasonDeckard

    My char array is confusing me

    Only four spaces are allocated for dest, but printf() will print until it reaches a null terminator or it attempts to read memory it doesn't have permission to read (causing the program to crash). The characters that do not fit into dest are still written because your told strncpy() there was...
  16. JasonDeckard

    My char array is confusing me

    A slight correction: The length provided as the third argument to strncpy must leave room for a null terminator, so this is more appropriate: strncpy(dest, source, sizeof(source) - 1); Sorry for any confusion. http://www.closedsocket.com/
  17. JasonDeckard

    My char array is confusing me

    You're passing in the size of source as the number of bytes to put into dest. That should read: strncpy(dest, source, sizeof(dest)); http://www.closedsocket.com/
  18. JasonDeckard

    Accurate transfer time calculation

    It is difficult to say because the speed of your hard drive is also a factor. The average effective rate on switched networks seems to be around 15 megabytes per second on 100baseT. Since you are going straight through using crossover, I imagine your rate will be better. Perhaps testing a...
  19. JasonDeckard

    Socket Error

    Kovacsa, That is a programming error caused by attempting to perform a socket function (such as setsockopt()) on a descriptor that is not actually a socket. Has the FTP software been recently ported to a different operating system? Regards, Jason Deckard http://www.closedsocket.com/
  20. JasonDeckard

    Changing the Blocked message on a netgear router

    If blocking it at your netgear isn't an option, consider updating your co-worker's HOSTS file. By adding an entry to resolve the Yahoo! Messenger server to a non-existant address on your LAN, he'll get connection time-outs when he tries to reach the messenger server. Before you mess around...

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