I just want to test whether this limit is within my organization. Is any method available by which I can check this?
Regards, Gaurav Kansal From: bind-users-bounces+gaurav.kansal=nic...@lists.isc.org [mailto:bind-users-bounces+gaurav.kansal=nic...@lists.isc.org] On Behalf Of Sten Carlsen Sent: Monday, December 31, 2012 4:02 PM To: bind-users@lists.isc.org Subject: Re: query about EDNS UDP Packet It means that something in your path limits packet size. That could likely be a firewall or router with a "helpful" function to pass DNS packets on; only it thinks that a DNS packet can only be 512 bytes long. On 31/12/12 10:49, Gaurav Kansal wrote: Hello Team, I am getting too many entries for reducing the EDNS Packet size to 512 bytes in my log file. For Eg: Dec 31 03:07:20 IPv6-DNS named[3769]: success resolving 'dns1.vps.net/A' (in 'vps.net'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:21 IPv6-DNS named[3769]: success resolving 'ad.metanetwork.com/A' (in 'metanetwork.com'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:25 IPv6-DNS named[3769]: success resolving 'geo.admetanetwork.com/A' (in 'admetanetwork.com'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:31 IPv6-DNS named[3769]: success resolving 'tomcat.apache.org/A' (in 'apache.org'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:31 IPv6-DNS named[3769]: success resolving 'www.apache.org/A' (in 'apache.org'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:31 IPv6-DNS named[3769]: success resolving 'issues.apache.org/A' (in 'apache.org'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/A' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns2.surfnet.nl/AAAA' (in 'surfnet.nl'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns2.surfnet.nl/A' (in 'surfnet.nl'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/AAAA' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving './NS' (in '.'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:40 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/A' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets Dec 31 03:07:40 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/AAAA' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets On googling for this, I got to know that this come when remote DNS Server doesn't support EDNS0 (i.e., packet size upto 4096 bytes). Now I want to know whether my DNS Server supports EDNS0 for incoming request or not. I use the 'OARC's DNS Reply Size Test Server' for the same and I got the below mentioned O/P: #dig +short rs.dns-oarc.net txt rst.x476.rs.dns-oarc.net. rst.x450.x476.rs.dns-oarc.net. rst.x490.x450.x476.rs.dns-oarc.net. "Tested at 2012-12-31 09:40:11 UTC" "164.100.1.206 sent EDNS buffer size 4096" "164.100.1.206 DNS reply size limit is at least 490" Does this mean that my server is not supporting EDNS0 ??? Thanks and Regards, Gaurav Kansal Mob - 9910118448 Happy New Year 2013. IPv4 is Over, Are your ready for new Network. _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users -- Best regards Sten Carlsen No improvements come from shouting: "MALE BOVINE MANURE!!!"
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