Was I the target of a successful attack?



  • I have a cluster of two PFsense node in CARP (pf01 and pf02). Both are 64 bits versions, under VMware vSphere. Both nodes have two vmxnet3 NICs with various vlan interfaces. I've installed the vmxnet3 following the steps provided in the pfsense docs.

    Today, the WAN vlan got knocked out of production. It stopped forwarding traffic. The CARP failover status showed pf01 and pf02 WAN VIP as master (others showed the correct master/backup states), but pf01 WAN did not forward traffic.

    Through a bad NAT configuration, ssh was exposed to the internet.

    I wondering a few things:

    1. could vmxnet3 be that unstable?
    2. Where should I look for more clues as to what happened?
    3. could someone, through an SSH exploit, kill traffic flowing through the WAN?

    I'm seeting that a lot, is it worry some?

    Jan  4 01:22:00 pf01 kernel: VMware memory control driver unloaded
    Jan  4 01:22:00 pf01 kernel: VMware memory control driver initialized

    But the most interresting part, here's the system log for the more or less 15 minutes just before the WAN crapped out:

    Jan  4 00:38:54 pf01 sshd[5193]: Failed password for admin from 87.106.251.42 port 51447 ssh2
    Jan  4 00:38:55 pf01 sshd[7634]: Failed password for admin from 87.106.251.42 port 51628 ssh2
    Jan  4 00:38:58 pf01 check_reload_status: Syncing firewall
    Jan  4 00:38:59 pf01 sshd[7811]: Invalid user debug from 87.106.251.42
    Jan  4 00:38:59 pf01 sshd[7811]: Failed password for invalid user debug from 87.106.251.42 port 52592 ssh2
    Jan  4 00:39:00 pf01 php: rc.filter_synchronize: Beginning XMLRPC sync to https://172.16.204.252:443.
    Jan  4 00:39:01 pf01 php: rc.filter_synchronize: XMLRPC sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:39:03 pf01 php: rc.filter_synchronize: Filter sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:39:03 pf01 sshd[8099]: Invalid user ftp from 87.106.251.42
    Jan  4 00:39:03 pf01 sshd[8099]: Failed password for invalid user ftp from 87.106.251.42 port 53541 ssh2
    Jan  4 00:39:05 pf01 sshd[8517]: Invalid user info from 87.106.251.42
    Jan  4 00:39:05 pf01 sshd[8517]: Failed password for invalid user info from 87.106.251.42 port 53954 ssh2
    Jan  4 00:39:06 pf01 sshd[9120]: Invalid user karaf from 87.106.251.42
    Jan  4 00:39:06 pf01 sshd[9120]: Failed password for invalid user karaf from 87.106.251.42 port 54230 ssh2
    Jan  4 00:39:07 pf01 sshd[9471]: Invalid user log from 87.106.251.42
    Jan  4 00:39:07 pf01 sshd[9471]: Failed password for invalid user log from 87.106.251.42 port 54406 ssh2
    Jan  4 00:39:08 pf01 sshd[9641]: Invalid user marketing from 87.106.251.42
    Jan  4 00:39:08 pf01 sshd[9641]: Failed password for invalid user marketing from 87.106.251.42 port 54618 ssh2
    Jan  4 00:39:09 pf01 sshd[10247]: Invalid user mike from 87.106.251.42
    Jan  4 00:39:09 pf01 sshlockout[37765]: Locking out 87.106.251.42 after 15 invalid attempts
    Jan  4 00:39:09 pf01 sshd[10247]: Failed password for invalid user mike from 87.106.251.42 port 54834 ssh2
    Jan  4 00:39:09 pf01 sshlockout[37765]: Locking out 87.106.251.42 after 15 invalid attempts
    Jan  4 00:39:37 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:37 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:40 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:40 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:50 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:50 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:54 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:54 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:57 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:39:57 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:40:08 pf01 check_reload_status: Syncing firewall
    Jan  4 00:40:08 pf01 check_reload_status: Reloading filter
    Jan  4 00:40:11 pf01 php: rc.filter_synchronize: Beginning XMLRPC sync to https://172.16.204.252:443.
    Jan  4 00:40:12 pf01 php: rc.filter_synchronize: XMLRPC sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:40:13 pf01 php: rc.filter_synchronize: Filter sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:40:24 pf01 sshd[34203]: Did not receive identification string from 222.186.56.43
    Jan  4 00:41:31 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:41:31 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:41:44 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:41:44 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:42:17 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:42:17 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:42:34 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:42:34 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:04 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:04 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:11 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:11 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:14 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:14 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:24 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:43:24 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:44:21 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:44:21 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:44:47 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:44:47 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:18 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:18 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:42 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:42 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:52 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:52 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:58 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:45:58 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:08 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:08 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:15 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:15 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:18 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:18 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:43 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:43 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:56 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:46:56 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:03 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:03 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:06 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:06 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:13 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:13 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:16 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:16 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:21 pf01 check_reload_status: Syncing firewall
    Jan  4 00:47:24 pf01 php: rc.filter_synchronize: Beginning XMLRPC sync to https://172.16.204.252:443.
    Jan  4 00:47:25 pf01 php: rc.filter_synchronize: XMLRPC sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:47:26 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:26 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:27 pf01 php: rc.filter_synchronize: Filter sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:47:36 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:36 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:40 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:40 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:46 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:46 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:50 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:50 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:53 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:53 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:56 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:47:56 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:00 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:00 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:03 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:03 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:07 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:07 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:10 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:10 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:13 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:13 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:19 pf01 check_reload_status: Syncing firewall
    Jan  4 00:48:20 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:20 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:21 pf01 php: rc.filter_synchronize: Beginning XMLRPC sync to https://172.16.204.252:443.
    Jan  4 00:48:22 pf01 php: rc.filter_synchronize: XMLRPC sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:48:23 pf01 php: rc.filter_synchronize: Filter sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:48:26 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:26 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:36 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:36 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:39 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:39 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:41 pf01 check_reload_status: Syncing firewall
    Jan  4 00:48:43 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:43 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:48:44 pf01 php: rc.filter_synchronize: Beginning XMLRPC sync to https://172.16.204.252:443.
    Jan  4 00:48:45 pf01 php: rc.filter_synchronize: XMLRPC sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:48:46 pf01 php: rc.filter_synchronize: Filter sync successfully completed with https://172.16.204.252:443.
    Jan  4 00:48:53 pf01 check_reload_status: Reloading filter
    Jan  4 00:48:59 pf01 sshd[81620]: Failed password for root from 222.186.56.43 port 2842 ssh2
    Jan  4 00:48:59 pf01 sshd[81620]: Failed password for root from 222.186.56.43 port 2842 ssh2
    Jan  4 00:49:01 pf01 sshd[81620]: Failed password for root from 222.186.56.43 port 2842 ssh2
    Jan  4 00:49:03 pf01 sshd[81620]: Failed password for root from 222.186.56.43 port 2842 ssh2
    Jan  4 00:49:03 pf01 sshd[81620]: Failed password for root from 222.186.56.43 port 2842 ssh2
    Jan  4 00:49:04 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:04 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:08 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:08 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:11 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:11 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:18 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:18 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:21 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:21 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:25 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:25 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:28 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:28 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:35 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:35 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:38 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:38 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:41 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:41 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:48 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:48 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:51 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:51 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:55 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:55 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:58 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:49:58 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:05 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:05 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:14 pf01 sshd[3184]: Failed password for root from 222.186.56.43 port 3942 ssh2
    Jan  4 00:50:14 pf01 sshd[3184]: Failed password for root from 222.186.56.43 port 3942 ssh2
    Jan  4 00:50:14 pf01 sshd[3184]: Failed password for root from 222.186.56.43 port 3942 ssh2
    Jan  4 00:50:15 pf01 sshd[3184]: Failed password for root from 222.186.56.43 port 3942 ssh2
    Jan  4 00:50:15 pf01 sshd[3184]: Failed password for root from 222.186.56.43 port 3942 ssh2
    Jan  4 00:50:16 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:16 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:20 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:20 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:23 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:23 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:26 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:26 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:30 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:30 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:43 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:43 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:53 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:53 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:56 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:50:56 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:51:03 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:51:03 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:51:06 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:51:06 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:51:13 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:51:13 pf01 sshd[11277]: error: accept: Software caused connection abort
    Jan  4 00:51:21 pf01 sshd[42291]: Failed password for root from 222.186.56.43 port 1488 ssh2
    Jan  4 00:51:22 pf01 sshd[42291]: Failed password for root from 222.186.56.43 port 1488 ssh2
    Jan  4 00:51:22 pf01 sshd[42291]: Failed password for root from 222.186.56.43 port 1488 ssh2
    Jan  4 00:51:22 pf01 sshd[42291]: Failed password for root from 222.186.56.43 port 1488 ssh2
    Jan  4 00:51:23 pf01 sshd[42291]: Failed password for root from 222.186.56.43 port 1488 ssh2
    Jan  4 00:51:23 pf01 sshlockout[37765]: Locking out 222.186.56.43 after 15 invalid attempts

    The public IP addresses you see are not mine.

    Thanks,


  • Banned

    DDoS on SSH and it created a buffer overflow and WAN went offline??



  • Could be something like that. Are you asking a question or are you telling me that's what you think it is? :)


  • Banned

    Thats a guess from here :)



  • how could I troubleshoot that further than reading from the logs in /var/log ?


  • Banned

    Make your attack surface as small as possible and harden the pfsense box.

    Disable SSH and predefined ports other than the outmost necessary.

    Run Snort with block option enabled and released every 24hrs.



  • could it be an idea to have fail2ban as part of a pfsense installation?

    fail2ban will prevent ddos attacks bringing down ssh.


  • Banned

    Would be a viable option to have indeed!



  • Is it possible to add a feature request for fail2ban in pfsense? I think this is important to prevent (D)DOS attacks leading to crash of service so my hope is that it is added to pfsense core and not as a package.


  • Banned

    @mir:

    Is it possible to add a feature request for fail2ban in pfsense? I think this is important to prevent (D)DOS attacks leading to crash of service so my hope is that it is added to pfsense core and not as a package.

    But it's already there. https://doc.pfsense.org/index.php/Sshlockout


  • Banned

    Maybe not working then?? or enabled??


  • Banned

    @Supermule:

    Maybe not working then?? or enabled??

    Erm… read the logs posted?

    Jan  4 00:51:23 pf01 sshlockout[37765]: Locking out 222.186.56.43 after 15 invalid attempts

    Looks damn well working.

    P.S. None of this protects against DDoS. Not possible. Won't save your WAN from crashing.


  • Banned

    Yes I can see that :) Thank you.

    https://doc.pfsense.org/index.php/HOWTO_enable_SSH_access

    Not a way to configure it. And it seems that all though i disable it on the webgui then it doesnt get disabled in the console menu.

    ![secure shell.PNG_thumb](/public/imported_attachments/1/secure shell.PNG_thumb)
    ![secure shell.PNG](/public/imported_attachments/1/secure shell.PNG)


  • Banned

    The console is responsive ONLY when you enable and disable the sshd.

    No can do via the gui.


  • Banned

    No idea what are you trying to do with console. Serial console is not SSH.


  • Banned

    I know…. but you can enable/disable it via the gui and via console.

    It doesnt work disabling it via the GUI. Only via the console...


  • Banned

    What's IT?!


  • Banned

    SSH :)


  • Banned

    Before disabling SSH via GUI:

    
    # netstat -an | grep .22
    tcp4       0      0 *.22                   *.*                    LISTEN
    tcp6       0      0 *.22                   *.*                    LISTEN
    
    

    After disabling SSH via GUI:

    
    # netstat -an | grep .22
    #
    
    

    Re-enabling SSH via console:

    
    # netstat -an | grep .22
    tcp4       0      0 *.22                   *.*                    LISTEN
    tcp6       0      0 *.22                   *.*                    LISTEN
    
    

    and checking back the GUI:


  • Banned

    Doesnt work here…



  • P.S. None of this protects against DDoS. Not possible. Won't save your WAN from crashing.

    This x 1000.  I don't know why so many people incorrectly think that a simple firewall rule can mitigate a DDoS attack.  I guess someone should tell the netops over at Sony and MS that they should add a firewall rule to stop their entire gaming networks from being blown offline like what happened a week or two ago…


  • Banned

    It doesnt stop it or prevent it…

    It handles it and doesnt interfere with normal services.

    And dont let the security at Sony disturb you at night....if North Korea can get in, everyone can....



  • @KOM:

    P.S. None of this protects against DDoS. Not possible. Won't save your WAN from crashing.

    This x 1000.  I don't know why so many people incorrectly think that a simple firewall rule can mitigate a DDoS attack.  I guess someone should tell the netops over at Sony and MS that they should add a firewall rule to stop their entire gaming networks from being blown offline like what happened a week or two ago…

    But depending on how your internal network is setup, the initial ddos on the wan could trigger a cascade of network activity which can slow the slower or under heavy load lans as well. With virtualisation becoming more common, the increased activity could also swap some cpu's as well.


  • Banned

    Thats why you have sinkholes and load balanced servers ;)



  • When you can afford it.

    Sadly I dont have GCHQ's or the NSA's budgets.  ;)


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