Re: mDNS Packet storm help
site_archiver@lists.apple.com Delivered-To: Macnetworkprog@lists.apple.com Howdy, Thanks, -Eric On Sep 29, 2005, at 8:43 PM, Marc Krochmal wrote: Hi Eric, <http://developer.apple.com/qa/qa2001/qa1176.html> Thanks. -Marc On Sep 29, 2005, at 6:19 PM, Eric Dahlman wrote: Howdy, Thanks, -Eric P.S. Both machines are running Tiger with the latest updates. This email sent to marc@apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Macnetworkprog mailing list (Macnetworkprog@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/macnetworkprog/site_archiver%40lists.... I have sent the trace in a separate message. Just some extra information here. At present mDNSresponder is taking up about 50% of my CPU and is about 864 K in size. When I went home last night my powerbook did not show any of this traffic and when I came in to the office it also did not. I noticed it after about half an hour and switching users, sorry I cannot say exactly when it started or if fast user switching was a contributing factor. I also started a packet trace with Ethereal to watch http traffic during this time but alas it got too big to be manageable. I will describe those problems in my next installment as I think they have a different cause but still may be related ;-) Could you capture a full packet trace in tcpdump format and then send it to me. In trying to track down another problem I have noticed that there is a huge amount of mdns generated by my machine. This is on the order of 1400 packets a second, that is kind of much I assume. I have included the details on one of these packets below. My machine is on a private net with IP 192.168.172.13 and the other machine (steinbit) is on the other side of a nat with a internet visible IP 204.72.xx.xx (to protect the innocent). If it matters my machine is a laptop that regularly moves between two different private networks natted to the internet (work and home). I would appreciate any idea about what is going on an what I can do to stop it. No. Time Source Destination Protocol Info 4 0.001356 192.168.172.1 224.0.0.251 MDNS Standard query response PTR steinbit._afpovertcp._tcp.local Frame 4 (191 bytes on wire, 191 bytes captured) Ethernet II, Src: Cisco-Li_20:09:1e (00:0f:66:20:09:1e), Dst: 01:00:5e:00:00:fb (01:00:5e:00:00:fb) Internet Protocol, Src: 192.168.172.1 (192.168.172.1), Dst: 224.0.0.251 (224.0.0.251) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x18 (DSCP 0x06: Unknown DSCP; ECN: 0x00) Total Length: 173 Identification: 0xa2a7 (41639) Flags: 0x00 Fragment offset: 0 Time to live: 254 Protocol: UDP (0x11) Header checksum: 0xcbda [correct] Source: 192.168.172.1 (192.168.172.1) Destination: 224.0.0.251 (224.0.0.251) User Datagram Protocol, Src Port: mdns (5353), Dst Port: mdns (5353) Source port: mdns (5353) Destination port: mdns (5353) Length: 153 Checksum: 0x0000 (none) Domain Name System (response) Transaction ID: 0x0000 Flags: 0x8400 (Standard query response, No error) Questions: 0 Answer RRs: 1 Authority RRs: 0 Additional RRs: 4 Answers _afpovertcp._tcp.local: type PTR, class IN, steinbit._afpovertcp._tcp.local Name: _afpovertcp._tcp.local Type: PTR (Domain name pointer) Class: IN (0x0001) Time to live: 1 hour, 15 minutes Data length: 11 Domain name: steinbit._afpovertcp._tcp.local Additional records steinbit-2.local: type AAAA, class FLUSH, addr fe80::20d: 93ff:fe65:a43e Name: steinbit-2.local Type: AAAA (IPv6 address) Class: FLUSH (0x8001) Time to live: 2 minutes Data length: 16 Addr: fe80::20d:93ff:fe65:a43e steinbit-2.local: type A, class FLUSH, addr 204.72.172.188 Name: steinbit-2.local Type: A (Host address) Class: FLUSH (0x8001) Time to live: 2 minutes Data length: 4 Addr: 204.72.172.188 steinbit._afpovertcp._tcp.local: type SRV, class FLUSH, priority 0, weight 0, port 548, target steinbit-2.local Name: steinbit._afpovertcp._tcp.local Type: SRV (Service location) Class: FLUSH (0x8001) Time to live: 2 minutes Data length: 8 Priority: 0 Weight: 0 Port: 548 Target: steinbit-2.local steinbit._afpovertcp._tcp.local: type TXT, class FLUSH Name: steinbit._afpovertcp._tcp.local Type: TXT (Text strings) Class: FLUSH (0x8001) Time to live: 1 hour, 15 minutes Data length: 1 Text: _______________________________________________ Do not post admin requests to the list. They will be ignored. Macnetworkprog mailing list (Macnetworkprog@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/macnetworkprog/marc% 40apple.com This email sent to site_archiver@lists.apple.com
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Eric Dahlman