nanog mailing list archives
Re: large organization nameservers sending icmp packets to dns servers.
From: Joe Abley <jabley () ca afilias info>
Date: Tue, 7 Aug 2007 15:19:30 -0400
On 7-Aug-2007, at 14:38, Patrick W. Gilmore wrote:
On Aug 7, 2007, at 2:14 PM, Donald Stahl wrote:All things being equal (which they're usually not) you could use the ACKresponse time of the TCP handshake if they've got TCP DNS resolution available. Though again most don't for security reasons...Then most are incredibly stupid.Those are impressively harsh words.
But they are hard to argue with.
In addition, any UDP truncated response needs to be retried via TCP- blocking it would cause a variety of problems.Since we are talking about authorities here, one can control the size of ones responses.
"Never reply with anything big and hence never set TC" seems like a reasonable, expedient way to circumvent the problem of wholesale 53/ tcp-blocking stupidity. It doesn't make the behaviour any less stupid, though.
The "security" argument looks even more bizarre when you consider what the DO bit in a request will do in general to the size of a response, in the case of an authority server which has signed zone data.
Joe
Current thread:
- Re: large organization nameservers sending icmp packets to dns servers., (continued)
- Re: large organization nameservers sending icmp packets to dns servers. John Levine (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Valdis . Kletnieks (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. John L (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Patrick W. Gilmore (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Chris L. Morrow (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Peter Dambier (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Joe Abley (Aug 06)
- RE: large organization nameservers sending icmp packets to dns servers. Jason J. W. Williams (Aug 07)
- RE: large organization nameservers sending icmp packets to dns servers. Donald Stahl (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Patrick W. Gilmore (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Joe Abley (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Kevin Oberman (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Donald Stahl (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Kevin Oberman (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Andrew Sullivan (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Douglas Otis (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Paul Vixie (Aug 08)
- Re: large organization nameservers sending icmp packets to dns servers. Douglas Otis (Aug 08)
- Re: large organization nameservers sending icmp packets to dns servers. Paul Vixie (Aug 08)
- Re: large organization nameservers sending icmp packets to dns servers. Douglas Otis (Aug 09)
- Re: large organization nameservers sending icmp packets to dns servers. Paul Vixie (Aug 09)