nanog mailing list archives
Re: DNS cache poisoning attacks -- are they real?
From: Florian Weimer <fw () deneb enyo de>
Date: Tue, 29 Mar 2005 17:43:17 +0200
* Chris Brenton:
In a perfect world, this might be a viable solution. The problem is there are far too many legitimate but "broken" name servers out there. On an average day I log well over 100 lame servers. If I broke this functionality, my helpdesk would get flooded pretty quickly with angry users.
Assuming BIND 9: /* * Is the server lame? */ if (fctx->res->lame_ttl != 0 && !ISFORWARDER(query->addrinfo) && is_lame(fctx)) { log_lame(fctx, query->addrinfo); result = dns_adb_marklame(fctx->adb, query->addrinfo, &fctx->domain, now + fctx->res->lame_ttl); if (result != ISC_R_SUCCESS) isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER, DNS_LOGMODULE_RESOLVER, ISC_LOG_ERROR, "could not mark server as lame: %s", isc_result_totext(result)); broken_server = DNS_R_LAME; keep_trying = ISC_TRUE; goto done; } So if you see something in the logs, it is already broken. 8-) The discussion in this part of the thread focuses on flagging more servers as lame (which are currently not detected by BIND or even logged).
Current thread:
- Re: DNS cache poisoning attacks -- are they real?, (continued)
- Re: DNS cache poisoning attacks -- are they real? Joe Maimon (Mar 27)
- Re: DNS cache poisoning attacks -- are they real? Randy Bush (Mar 27)
- Re: DNS cache poisoning attacks -- are they real? Christopher L. Morrow (Mar 27)
- Re: DNS cache poisoning attacks -- are they real? John Payne (Mar 28)
- Re: DNS cache poisoning attacks -- are they real? Randy Bush (Mar 28)
- Re: DNS cache poisoning attacks -- are they real? John Payne (Mar 28)
- Re: DNS cache poisoning attacks -- are they real? Simon Waters (Mar 29)
- Re: DNS cache poisoning attacks -- are they real? Florian Weimer (Mar 29)
- Message not available
- Re: DNS cache poisoning attacks -- are they real? Florian Weimer (Mar 30)
- Re: DNS cache poisoning attacks -- are they real? Chris Brenton (Mar 29)
- Re: DNS cache poisoning attacks -- are they real? Florian Weimer (Mar 29)
- Re: DNS cache poisoning attacks -- are they real? John Payne (Mar 30)
- Re: DNS cache poisoning attacks -- are they real? Chris Brenton (Mar 28)
- Re: DNS cache poisoning attacks -- are they real? Joe Maimon (Mar 29)
- Re: DNS cache poisoning attacks -- are they real? Chris Brenton (Mar 29)
- Re: DNS cache poisoning attacks -- are they real? Sam Hayes Merritt, III (Mar 29)
- Message not available
- Re: DNS cache poisoning attacks -- are they real? Joe Maimon (Mar 29)
- Re: DNS cache poisoning attacks -- are they real? Florian Weimer (Mar 30)
- Re: DNS cache poisoning attacks -- are they real? Joe Maimon (Mar 30)
- Re: DNS cache poisoning attacks -- are they real? bmanning (Mar 27)
- Re: DNS cache poisoning attacks -- are they real? Joe Maimon (Mar 27)