Local Packet Filters

Discussion in 'all things UNIX' started by Searching_ _ _, Jan 21, 2012.

Thread Status:
Not open for further replies.
  1. Searching_ _ _

    Searching_ _ _ Registered Member

    Joined:
    Jan 2, 2008
    Posts:
    1,988
    Location:
    iAnywhere
    Besides iptables are there any other packet filters in Ubuntu?

    I'm trying to run a tool and it says that a local packet filter is blocking it.
    I checked iptables and ufw and don't see any rules loaded.

    What other packet filter could be blocking the tool from running?
     
  2. Ocky

    Ocky Registered Member

    Joined:
    May 6, 2006
    Posts:
    2,677
    Location:
    George, S.Africa
    As a matter of interest what tool are you trying to run ? Maybe you need to reinstall it or reconfigure it ? Eg. hddtemp daemon listens on port 7634 - you can run sudo dpkg-reconfigure <packagename> to answer the config question(s) again.
    What is the full output when you run the tool from terminal ?
     
  3. Searching_ _ _

    Searching_ _ _ Registered Member

    Joined:
    Jan 2, 2008
    Posts:
    1,988
    Location:
    iAnywhere
    Code:
    # lft -E -V -S www.wilderssecurity.com
    Setting my ISN = 583708272
    SEND TTL=0 TSEQ=130600769 FLAGS=1
    SEND TTL=1 TSEQ=1620080557 FLAGS=1
    SEND TTL=2 TSEQ=289367011 FLAGS=1
    SEND TTL=3 TSEQ=1251735866 FLAGS=1
    SEND TTL=4 TSEQ=1100380911 FLAGS=1
    SEND TTL=0 TSEQ=1866407378 FLAGS=1
    SEND TTL=1 TSEQ=591121198 FLAGS=1
    SEND TTL=2 TSEQ=1713968061 FLAGS=1
    SEND TTL=3 TSEQ=694589219 FLAGS=1
    SEND TTL=4 TSEQ=1265003394 FLAGS=1
    SEND TTL=0 TSEQ=1990517898 FLAGS=1
    SEND TTL=1 TSEQ=611538595 FLAGS=1
    SEND TTL=2 TSEQ=1687552254 FLAGS=1
    SEND TTL=3 TSEQ=1151429089 FLAGS=1
    SEND TTL=4 TSEQ=1831270677 FLAGS=1
    SEND TTL=5 TSEQ=418521168 FLAGS=1
    Sending FIRST PACKET for hop 0
    SEND TTL=0 TSEQ=302036237 FLAGS=2
    SEND TTL=6 TSEQ=1031453617 FLAGS=1
    Sending FIRST PACKET for hop 1
    SEND TTL=1 TSEQ=211169829 FLAGS=2
    Sending FIRST PACKET for hop 2
    SEND TTL=2 TSEQ=1914045655 FLAGS=2
    Sending FIRST PACKET for hop 3
    SEND TTL=3 TSEQ=1995602723 FLAGS=2
    Sending FIRST PACKET for hop 4
    SEND TTL=4 TSEQ=1341763911 FLAGS=2
    SEND TTL=5 TSEQ=1692723661 FLAGS=1
    SEND TTL=0 TSEQ=2106428100 FLAGS=2
    SEND TTL=1 TSEQ=368242436 FLAGS=2
    SEND TTL=2 TSEQ=1452553790 FLAGS=2
    SEND TTL=6 TSEQ=741296952 FLAGS=1
    SEND TTL=3 TSEQ=1851461765 FLAGS=2
    SEND TTL=4 TSEQ=632817574 FLAGS=2
    SEND TTL=5 TSEQ=1928458772 FLAGS=1
    SEND TTL=0 TSEQ=287686389 FLAGS=2
    SEND TTL=1 TSEQ=763418343 FLAGS=2
    SEND TTL=2 TSEQ=1401055681 FLAGS=2
    SEND TTL=6 TSEQ=577053400 FLAGS=1
    SEND TTL=3 TSEQ=2015154210 FLAGS=2
    SEND TTL=4 TSEQ=353952945 FLAGS=2
    Sending FIRST PACKET for hop 5
    SEND TTL=5 TSEQ=295977130 FLAGS=2
    SEND TTL=7 TSEQ=458791760 FLAGS=1
    SEND TTL=8 TSEQ=2067921006 FLAGS=1
    Sending FIRST PACKET for hop 6
    SEND TTL=6 TSEQ=990566349 FLAGS=2
    
    
    LFT can't seem to round-trip.  Local packet filter in the way?Concluding with 1 hops.
    
    TTL  LFT trace to wilderssecurity.com (66.227.46.190):80/tcp
    **   [80/tcp failed]  Try alternate options or use -V to see packets.
    There is either a packet filter running or this error occurs for another reason?
    As far as I could determine I found no traditional packet filters running on my system.
     
  4. iceni60

    iceni60 ( ^o^)

    Joined:
    Jun 29, 2004
    Posts:
    5,116
    is it a remote, locate packet filter??

    edit. 80/tcp failed. maybe it's your browser blocking it. but, i don't really know tbh.
     
    Last edited: Jan 23, 2012
  5. Mrkvonic

    Mrkvonic Linux Systems Expert

    Joined:
    May 9, 2005
    Posts:
    8,695
    It is also possible that some routers drop packets. Does not have to be a local problem at all. There could be a million contributing factors, including your ISP. Did you try different computers/distros, with and without your router, different sites, etc.

    Regards,
    Mrk
     
  6. Ocky

    Ocky Registered Member

    Joined:
    May 6, 2006
    Posts:
    2,677
    Location:
    George, S.Africa
    Mtr is quite a useful tool, traceroute and ping combined.

    mtr.png
     
Thread Status:
Not open for further replies.