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http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120 t/120t5/iosfw2/iosfw2_2.htm#xtocid1359543 SMTP Messages CBAC detects and blocks SMTP attacks (illegal SMTP commands) and notifies you when SMTP attacks occur. Error messages such as the following may indicate that an SMTP attack has occurred: %FW-4-SMTP_INVALID_COMMAND: Invalid SMTP command from initiator (192.168.12.3:52419) Looks like it does do that after all... IOS FW also monitors HTTP, CU-SeeMe, FTP, H.323, NetShow, r-commands, RealAudio, Sun RPC, SQL*Net, StreamWorks, TFTP, VDOLive, and generic TCP/UDP sessions in addition to SMTP. It also protects against fragment attacks, SYN attacks, ACK attacks, and bogus TCP sequence numbers. Randy: ip inspect name firewall smtp S Stephen Sprunk, K5SSS, CCIE#3723 Network Consulting Engineer Cisco NSA Dallas, Texas, USA e-mail:[email protected] Pager: +1 800 365-4578 Empowering the Internet Generation ----- Original Message ----- From: Alex P. Rudnev To: Gerry McDonald Cc: [email protected] Sent: Wednesday, September 22, 1999 5:37 Subject: Re: your mail Get IOS FireWall Feauture set, router with the 2 LAN and 2 WAN interfaces, and say _get away_ to the hw vendors. No doubt, it's possible to enter into IOS if you did not installed access lists on the VTY, keep working some extra services (such as router-based WWW) or so on; but it do not depend of the firewalls at all... And - if you don't need session-level firewall (with the analysing of SMTP content for example) IOS FW feature set is very effective solution. Aleksei Roudnev, Network Operations Center, Relcom, Moscow (+7 095) 194-19-95 (Network Operations Center Hot Line),(+7 095) 230-41-41, N 13729 (pager) (+7 095) 196-72-12 (Support), (+7 095) 194-33-28 (Fax)
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