1. Need starting Internet filter rules for IOS/700 (Cisco 776M)
I saw a note about this from somebody else in comp.dcom.isdn, and I am
pretty much in the same situation. Since I haven't seen an answer yet...
I have a Cisco 776M for connecting to the Internet. On the local side of
the router it's a SOHO LAN, TCP/IP over Ethernet, with four to five
Win95-based machines and, later, one NT box and possibly a Linux box.
There are a couple of printers on micro-servers, so I'm not doing any
printer sharing, however one selected directory on each machine *is* set
up for read-only file sharing.
Does anyone have a group of filter rules for the 700 series that is
reasonably safe for connecting a LAN supporting file-sharing Win95 to the
I have some rules from Cisco that will prevent loopback attacks and so
on, and I know how to block NetBios queries and local LAN traffic from
making it out to the Internet. What I *don't* have is a clear enough
understanding of things to be sure I'm correctly setting up filters to
prevent people from getting into the LAN.
I will be offering no services, and there will be no ISDN dial-in
capabilities. Basically, anything that comes to me unrequested (with the
SYN flag set, I assume?) from the WAN side, I want to reject with extreme
prejudice... but I still want to be able to FTP, etc. I have a dynamic
IP address, and I am running NAT inside the box so *supposedly*, I am
told, it wouldn't be possible to get anything useful back onto the LAN
even via IP spoofing. But before I get complacent, I wanted to ask the
So, how about it? Has anyone who would be willing to share, set up a
batch of IOS-700 filters that makes a reasonable firewall (well, as best
as is possible with packet-level filtering within a router)?
(BTW, I have an old 486 or a slow Pentium I could press into service with
a couple of NICs to insert a "real" firewall (proxy server, etc.) If
anyone has thoughts or recommendations I would love to hear them... but
I'd still like to do the best possible job with the router filtering,
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