How can i defend a DDOS attack

Discussions for BiPAC 8800 series: 8800NL
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palmy100
Posts: 2
Joined: Tue Dec 10, 2019 12:48 pm

How can i defend a DDOS attack

Post by palmy100 » Tue Dec 10, 2019 1:51 pm

Hi,

Router = BiPac 880NL R2.

We are experiencing an amplified reflection DDOS attack - CLDAP - port 389 UDP. This is attacking our Windows Server SBS 2011 (Win Server 2008) - I've found some advice online about setting a Local Security Policy on the Server to block UDP 389 but that results in Active Directory breaking so my users can't authenticate.

Is there a way to set up the BiPAC router firewall to stop this. I've looked at Incoming Filters but not sure how to configure it properly.

Thanks in advance.

billion_fan
Posts: 5205
Joined: Tue Jul 19, 2011 4:30 pm

Re: How can i defend a DDOS attack

Post by billion_fan » Tue Dec 10, 2019 3:00 pm

palmy100 wrote:
Tue Dec 10, 2019 1:51 pm
Hi,

Router = BiPac 880NL R2.

We are experiencing an amplified reflection DDOS attack - CLDAP - port 389 UDP. This is attacking our Windows Server SBS 2011 (Win Server 2008) - I've found some advice online about setting a Local Security Policy on the Server to block UDP 389 but that results in Active Directory breaking so my users can't authenticate.

Is there a way to set up the BiPAC router firewall to stop this. I've looked at Incoming Filters but not sure how to configure it properly.

Thanks in advance.
Try following the attached screen shot
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palmy100
Posts: 2
Joined: Tue Dec 10, 2019 12:48 pm

Re: How can i defend a DDOS attack

Post by palmy100 » Wed Dec 11, 2019 2:53 pm

Thanks - fingers crossed that this works for us. Looking good at the moment.

anajames
Posts: 29
Joined: Wed Mar 01, 2017 8:02 am

Re: How can i defend a DDOS attack

Post by anajames » Wed Dec 18, 2019 6:49 am

Its a very hit or miss. Contrary to most providers ways of doing it, IP’s are generally assigned for DSL service. Sometimes Disconnecting the connection for a bit will hault the attack and provide you specifics on it.

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