Novell (NOVL) dirt cheap, good buy? Message Board

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Technology Stocks : Novell (NOVL) dirt cheap, good buy?

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To: Jim McCormack who wrote (19540)	1/12/1998 11:17:00 PM
From: Scott C. Lemon	of 42771

Hello Jim, > Scoop On TCPIP Attacks > > These attacks are very easy to do because all of the TCPIP specs > are detailed in the RFCs. Yep ... very familiar with the RFCs ... I've reviewed many and have read most of the protocol RFCs. (Yeah ... it's sick but true!) > If hackers continue to concentrate on them they will in all > probability continue to think up ways to exploit the "Cooperative" > nature of network protocols. After all the goal is to connect > devices - so the protocols are very patient with errors and attempt > to process the packets. They give out information too freely > as well in the interest of forging a connection... It's interesting to follow what the hackers are doing as they learn. Many of the denial-of-service attacks (such as the SYN attack) are based around tying up all the available connections on your server. There are work-arounds for this. This new class are taking advantage of both the public nature of TCP/IP, and the way that vendors write their code. As Microsoft is finding, a vendor can reduce the overhead in a poorly written TCP/IP stack by minimizing error checking. This increases performance because when a packet arrives, you just trust that "it's a good packet" ... but the attacks are sending purposely corrupt or bad packets at these servers. That's when you see these effects ... > Get a firewall and implement packet filtering and then remove the > "Trust" relationships to hosts outside the LAN on the Internet..... Yep ... BorderManager can do that! ;-) > A step by step how to "Attack" and how to "Prevent Attacks" > fc.net Details on the current attacks is available from: cert.org > Enjoy... Good URL ... I'll have to read the whole thing in more detail, but it looks like a poor man's guide to some IP principles ... > God I'm bored.... I'm buried! Busy day tomorrow ... > Jim McCormack Scott C. Lemon

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