What is SonicWall DNS sinkhole service?
A DNS sinkhole — also known as a sinkhole server, Internet sinkhole, or Blackhole DNS — is a DNS server that gives out false information to prevent the use of the domain names it represents.
What type of malware can DNS sinkhole block?
A sinkhole is a way of redirecting malicious internet traffic so that it can be captured and analyzed by security analysts. Sinkholes are most often used to seize control of botnets by interrupting the DNS names of the botnet that is used by the malware.
Does SonicWall do DNS filtering?
A SonicWall administrator can choose to enable these signatures in any of the following methods: Block the whole DNS application group, which will block all DNS queries passing through the SonicWall. Block individual signatures.
Can SonicWall act as DNS server?
No, SonicWall does not act as a real DNS server.
What is Sinkholing a domain?
DNS Sinkholing is a mechanism aimed at protecting users by intercepting DNS request attempting to connect to known malicious or unwanted domains and returning a false, or rather controlled IP address. The controlled IP address points to a sinkhole server defined by the DNS sinkhole administrator.
What is DNS poisoning?
DNS cache poisoning is the act of entering false information into a DNS cache, so that DNS queries return an incorrect response and users are directed to the wrong websites. DNS cache poisoning is also known as ‘DNS spoofing.
How do I stop DNS traffic?
Blocking External Client DNS Queries
- Navigate to Firewall > Rules, LAN tab.
- Create the block rule as the first rule in the list: Click Add to create a new rule at the top of the list.
- Create the pass rule to allow DNS to the firewall, above the block rule:
- Click Apply Changes to reload the ruleset.
What is DNS proxy in SonicWall?
An IPv4 interface can do name resolution on an IPv4 Internet, and an IPv6 interface can only do name resolution on an IPv6 Internet through DNS proxy. To allow IPv4 clients to access DNS services in a network with mixed IPv4 and IPv6 interfaces, SonicOS/X supports DNS proxy.
How do I add a DNS entry to SonicWall?
Navigate to Network > DNS > DNS Proxy. Click the Static DNS Proxy Cache Entries tab. Click Add. The Add Static DNS Cache dialog displays….For each static DNS cache entry you want to add:
- In the Domain Name field, enter a domain name .
- For IPv4 static DNS cache:
- For IPv6 static DNS cache:
- Click Save.
What do botnets steal?
Botnets can be used to perform Distributed Denial-of-Service (DDoS) attacks, steal data, send spam, and allow the attacker to access the device and its connection. The owner can control the botnet using command and control (C&C) software. The word “botnet” is a portmanteau of the words “robot” and “network”.
What is a sinkhole server?
“A sinkhole is a server designed to capture malicious traffic and prevent control of infected computers by the criminals who infected them,” Hutchins wrote in a postmortem of the WannaCry episode.
What is DNS sinkholing and how does it work?
This can be achieved by configuring the DNS forwarder to return a false IP address to a specific URL. DNS sinkholing can be used to prevent access to malicious URLs at an enterprise level.
What is DNS sinkhole malware?
With the basic sinkhole functionality, the malware on the infected machine attempts to initiate a connection to a system hosted on a URL with a known malicious domain configured in the DNS sinkhole. But the request is not passed to the malicious URL.
What are the risks of DNS sinkholes?
Also, the malicious IP information gathered from open sources that are to be given into the DNS sinkhole may contain false positives. The sources may contain a URL that is not malicious, and hence it will result in an unwanted restriction to legitimate websites.
What happens to my IP address if my domain is sinkholed?
Typically, the Domain Name System server would respond with the IP address where wired.com is hosted; however, if the domain was sinkholed, your browser would be redirected to an IP address other than WIRED’s.”