port blocking

Discussion in 'Security Software' started by RB, Mar 20, 2010.

  1. RB

    RB Guest

    I am still confused about this issue and need some reinforcement of
    ramifications. If I go into my router's setup and block ports
    135~139 and 445, I understand this will block access of these ports
    to anything coming from outside of my NAT router.
    But does blocking any of these ports interfere with netbios sharing
    of my workgroup inside (behind the NAT but still going thru wireless
    port on router ) my LAN ?
     
    RB, Mar 20, 2010
    #1
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  2. From: "RB" <NoMail@NoSpam>

    | I am still confused about this issue and need some reinforcement of
    | ramifications. If I go into my router's setup and block ports
    | 135~139 and 445, I understand this will block access of these ports
    | to anything coming from outside of my NAT router.
    | But does blocking any of these ports interfere with netbios sharing
    | of my workgroup inside (behind the NAT but still going thru wireless
    | port on router ) my LAN ?


    No. It does not affect nodes on the LAN. It only affects communications going across the
    LAN/WAN barrier. That is the whole idea.
     
    David H. Lipman, Mar 20, 2010
    #2
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  3. RB

    RB Guest

    So when I block these ports in my Linksys router, it only blocks on
    the WAN port going to my cable modem and it does not block the
    router's wireless port and the router's hard wire Lan ports.
    And when I read texts that state disabling certain ports between 135 ~ 139
    will keep the Netbios name table and browser service from working, they are
    referring only to access coming in thru the WAN ( I surmise Remote access
    and/or VPN ? ) .
    Correct ?
     
    RB, Mar 20, 2010
    #3
  4. From: "RB" <NoMail@NoSpam>

    | So when I block these ports in my Linksys router, it only blocks on
    | the WAN port going to my cable modem and it does not block the
    | router's wireless port and the router's hard wire Lan ports.
    | And when I read texts that state disabling certain ports between 135 ~ 139
    | will keep the Netbios name table and browser service from working, they are
    | referring only to access coming in thru the WAN ( I surmise Remote access
    | and/or VPN ? ) .
    | Correct ?

    Y E S !
     
    David H. Lipman, Mar 20, 2010
    #4
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