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Hi,<br />
<br />
Our firewall is reporting that more than 3000 packets have been marked as portscan attacks. Source port is 53 and it is from our ISP IP range &nbsp;and destination port is range between 59000 and 61000.<br />
<br />
I have already reported to our ISP but I just want to know what security issues might be related to this sort of portscan.
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Hi,

Our firewall is reporting that more than 3000 packets have been marked as portscan attacks. Source port is 53 and it is from our ISP IP range  and destination port is range between 59000 and 61000.

I have already reported to our ISP but I just want to know what security issues might be related to this sort of portscan.

DNS massive portscan

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.

Software Firewalls

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.

Network Security

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.