Full Disclosure mailing list archives
Re: ICMP (was: daily internet traffic report)
From: Cedric Blancher <blancher () cartel-securite fr>
Date: Sun, 17 Oct 2004 23:46:11 +0200
Le dim 17/10/2004 à 22:21, James Edwards a écrit :
So, blocking ***all*** ICMP ***types*** is bad but you can block some ***types*** without getting into trouble. Till you understand that all the types do in relation to networking I would leave the alone.
Nowadays, using a decent stateful firewall allows one to get rid of ICMP filtering by associating ICMP errors to existing connections. As an example, when filtering using Netfilter, ICMP errors triggered by known IP connections are recognized as such (i.e. RELATED state) and thus can be filtered in a different way unsollicited ones (i.e. INVALID state) are. This kind of feature allows one not to block valid ICMP stuff and keep away from direct ICMP solicitations you can filter the way you want. My 0.02€... -- http://www.netexit.com/~sid/ PGP KeyID: 157E98EE FingerPrint: FA62226DA9E72FA8AECAA240008B480E157E98EE
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Current thread:
- Re: [SPAM] Re: [SPAM] Your daily internet traffic report, (continued)
- Re: [SPAM] Re: [SPAM] Your daily internet traffic report Hugo van der Kooij (Oct 16)
- Re: [SPAM] Your daily internet traffic report Frank de Wit (Oct 17)
- Re: [SPAM] Your daily internet traffic report lee . e . rian (Oct 16)
- Re: [SPAM] Re: [SPAM] Your daily internet traffic report Hugo van der Kooij (Oct 17)
- Re: [SPAM] Your daily internet traffic report Dave Horsfall (Oct 17)
- Re: [SPAM] Your daily internet traffic report Michal Zalewski (Oct 17)
- Re: [SPAM] Your daily internet traffic report Gary E. Miller (Oct 17)
- Re: [SPAM] Re: [SPAM] Your daily internet traffic report Hugo van der Kooij (Oct 17)
- ICMP (was: daily internet traffic report) Frank de Wit (Oct 17)
- Re: ICMP (was: daily internet traffic report) James Edwards (Oct 17)
- Re: ICMP (was: daily internet traffic report) Cedric Blancher (Oct 17)
- Re: ICMP (was: daily internet traffic report) James Edwards (Oct 17)
- Re: ICMP (was: daily internet traffic report) Cedric Blancher (Oct 17)
- Re: ICMP (was: daily internet traffic report) james edwards (Oct 18)
- Re: ICMP (was: daily internet traffic report) Cedric Blancher (Oct 18)
- Re: ICMP - Today India, Samoa, and Iran are in the tank - back to orginal thread DDoS, or No DDoS? vigilaro (Oct 18)