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Full Discussion: denial of serivce!!
Top Forums UNIX for Advanced & Expert Users denial of serivce!! Post 24823 by alphawave on Thursday 18th of July 2002 07:00:45 AM
Old 07-18-2002
Keeping the server daemons and OS tcp/ip stack patched cannot be stressed enough, the most effective DOS attacks are those which cause much system resource to be consumed for little traffic (such as a buffer overflow crashing an apache process, the request is small but the recovery uses resource, If I can send 100 requests a second to a vulnerable box then it has to spawn 100 processes a second and still serve other clients, this scales rather badly).

There are two other things you can do:

1.) Look at your gateway routers and be certain these too are patched. You may like to look at some of the advanced traffic queueing options which may be there.

2.) A proactive monitoring system so you can detect abnomally high loads on a machine,strange traffic patterns in your network , alalyse events and then block the source IP addresses as far out as possible (preferably at your ISP, otherwise he who has the greated bandwidth will win).
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install-solaris(1M)													       install-solaris(1M)

install-solaris - install the Solaris operating system SYNOPSIS
install-solaris install-solaris invokes the Solaris Install program. Depending on graphical capability and available memory at the time of invocation, install-solaris invokes either a text-based installer or a graphical installer. The following minimum requirements for physical memory dictate which features are available during installation: For SPARC machines: 128 MB Minimum physical memory for all installation types 128 MB Minimum physical memory required for windowing system 384 MB Minimum physical memory required for graphical-based installation For x86 machines: 256 MB Minimum physical memory for all installation types 256 MB Minimum physical memory required for windowing system 512 MB Minimum physical memory required for graphical-based installation In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number of fea- tures available. install-solaris exists only on the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the for more details. install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the installation media. Refer to the for disk space requirements. Refer to the for more information on the various menus and selections. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcdrom (Solaris instal- | | |lation media) | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ pkginfo(1), install(1M), pkgadd(1M), attributes(5) It is advisable to exit install-solaris by means of the exit options in the install-solaris menus. 23 Sep 2005 install-solaris(1M)

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