UDP rule for BT , P2P tv , msn & YIM ?

Discussion in 'LnS English Forum' started by -NiCeGuY-, May 6, 2007.

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  1. -NiCeGuY-

    -NiCeGuY- Registered Member

    Mar 5, 2007
    when i am using uTorrent/MSN/YIM , i saw my log blocked some UDP connection , am i need create another rule for those prog ? For uTorrent , i enabled UPnP on my router & windows firewall , but... still saw LnS block 1900@UDP connect to my , why ?

    Another thing when i am using uTorrent/Sopcast(P2P tv) , i saw block some ICMP , am i need rule ?

    see picture



    Enabled UPnP 1900@UDP in wondows firewall


    Blocked ICMP from LnS


    Blocked 1900@UDP

    Am i need create UDP & IGMP rule , if so how ? ty 4 reply :D
  2. Climenole

    Climenole Look 'n' Stop Expert

    Jun 3, 2005
    Hi -NiCeGuY- (is this the correct translation: 喜好人 ?) :)

    1- the UDP packets on port 1900 comes from the Windows service SSDP...
    [Simple Service Discovery Protocol] and are used by Microsoft Messenger (as far as I Know).

    You may create a specific rule for this allowing UDP to remote 1900 for Genereric Host Process (svchost). This GHP is also listening on local port 1900...
    (Why? no idea.)

    Remark: don't use 2 firewal in the same time. If you use LNS, you don't have to use the W xp (Half-)firewall ...

    2- Icmp type 3 code 1 = machine unaccessible
    Icmp type 3 code 3 = port unreachable...

    Ignore them (let LNS block theses Icmp type/code):

    The only ICMP type/code allowed over internet are normally:

    Type 8 code 0 : Echo outbound only
    Type 0 code 0 : Echo reply (to the previous "ping") inbound only
    Type 11 code 0 : Timeout (used by Trace route...) inbound only

    In a local network, on the client PCs, ICMP type 3 code 4 must be allowed in and out within the network (means "Fragmentation needed but a Don't Fragment flag is set.")

    All the other Icmp type/code have to be blocked by the firewall. Blocked and logged to help you to find some events happened in the Network.

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