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  1. ubuntu sending packets to 224.0.0.251:5353

    hello guys:

    why ubuntu keep sending out mDNS packets? but supposedly mDNS is not running. i checked my firewall logs:


    Mar 17 23:43:27 <security.info> FW kernel: ipfw: 9999 Deny UDP...
  2. change numbers of rows and columns of "show application" icons

    hello team:

    are there anyways to change rows and columns in app launcher similar like Mac OS? the default is 4 rows and 6 columns

    thanks

    _dave
  3. Re: t420, pressing SHIFT for the GRUB menu doesn't work

    sorry, it is not dual boot. the machine is lenovo t420 and ubuntu 20.4 is the only OS for this machine. yes it uses UEFI boot instead of legacy bios. i forgot password and try to get into single...
  4. t420, pressing SHIFT for the GRUB menu doesn't work

    hello team:

    i am using old t420 for ubuntu 20.4. supposedly
    pressing shift would bring up GRUB menu but in my case, it doesn't do anything.

    how could i bring up GRUB menu as needed?

    thanks...
  5. Re: after updates, ubuntu lost its original desktop environment

    confirmed! thanks.
  6. Re: after updates, ubuntu lost its original desktop environment

    this workstation has been in operation for over 3 months until this upgrade (not a VM). that is why i suspect the new nvidia driver has problem.

    i don't remember i installed secure boot. how could...
  7. Re: after updates, ubuntu lost its original desktop environment

    [/FONT][/COLOR]


    user@home:~$ sudo lshw -C display
    [sudo] password for user:
    *-display UNCLAIMED
    description: VGA compatible controller
    product: GF119M [Quadro NVS...
  8. after updates, ubuntu lost its original desktop environment

    hello team:

    after today's updates, my display resolution only has 640x480(4:3) (no other options anymore). also second monitor is not recognizable any more. are there ways to fix this? is it a bad...
  9. Thread: iptables rules

    by dave219
    Replies
    3
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    4

    [ubuntu] Re: iptables rules

    thanks.

    those rule sets are to drop packets from and to 128.0.0.0/8. i borrowed them from ipfw rules.

    btw, what is the default action for "iptables -A INPUT -j LOG"? just log packets? so shall...
  10. Thread: iptables rules

    by dave219
    Replies
    3
    Views
    4

    [ubuntu] iptables rules

    hello team:

    i need help to check my rules for iptables (converted from ipfw). what i intend to do is to specify specific rules first (drop or accept) then drop (and log) anything else:

    sudo...
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    ubuntu 16.04 rkhunter won't update

    hello team:

    i am trying to get rthunter updated but failed to do so:

    user@host:~$ sudo rkhunter --update


    [sudo] password for user:
    [ Rootkit Hunter version 1.4.2 ]
  12. Replies
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    vnc server questions

    hello guys:

    newbie to linux is asking help here. i am using older release:

    user@host:~$ lsb_release -a
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description: Ubuntu 16.04.6...
  13. Re: ubuntu 16.04.6 LTS how to turn off default ports

    thanks for advice. i will turn the UFW on later.

    but i would like to turn some ports off such as 119, 79, 12345 etc. i really don't want people to finger my server, also am not sure i would ever...
  14. ubuntu 16.04.6 LTS how to turn off default ports

    hello team:

    i just installed ubuntu 16.04 and found out a lot of ports opened by default. how could i turn those ports off?


    user@home:~:$ nmap -Pn 192.168.1.10
    Starting Nmap 7.80 (...
  15. Re: newbie ufw question: specificity interface ip ranges and port/proto

    never mind. i used this command and it worked:

    sudo ufw allow in on eth1 from 192.168.0.0/24 to any port 22 proto tcp
  16. newbie ufw question: specificity interface ip ranges and port/proto

    hello guys:

    i have a system with multiple interfaces and tried to set up a rule that specifies interface, ip range, port/proto.

    user@home:~$ sudo ufw allow in on eth1 to 192.168.0.10 from...
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    314

    [ubuntu] ubuntu 14 vlan tagged interface

    hi all:

    what is proper way to make my ethernet interface vlan tagged? here is what i have and i suspect it is not properly configured since my box would not put packets out of the interface:
    ...
  18. Replies
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    187

    multihome routing issue (not router)

    hi all:

    i am newbie to linux. i have issues with multihome routing environment (ubuntu 14.x)

    the system has two physical interfaces and one tagged sub-interface under eth1: eth0 eth1 and...
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