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Does anybody happen to know why a mDNS "A" type request would work for WindowsXP but not for Mac OSX.

Subject: Does anybody happen to know why a mDNS "A" type request would work for WindowsXP but not for Mac OSX.
From: "Chris J. Miller" <email@hidden>
Date: Fri, 20 Jul 2007 13:14:28 -0400
Delivered-to: email@hidden
Delivered-to: email@hidden

Does anybody happen to know why a mDNS "A" type request would work for WindowsXP but not for Mac OSX. I'm teaching myself mDNS by programming an embedded device to respond to mDNS type "A" queries. I beleive I'm doing everything correctly but Mac OSX doesn't accept my response while WindowsXP does. I've tried changing many things (flags,UDP source port, etc.) but can't seem to get OSX to accept my request. My embedded device is named junk.local and I'm testing this by doing a "ping junk.local". OSX responds with "ping: cannot resolve junk.local: Unknown host" while WindowsXP resolves the name and pings my device as expected.

Thanks,
Chris

Here are the specifics of the packets that are exchanged...

WindowsXP ip address = 192.168.254.3
Macbook ip address = 192.168.254.6
embedded device name = junk.local, ip address = 192.168.254.21


This works!

received by embedded device from WindowsXP SP2 0x01 0x00 0x5e 0x00 0x00 0xfb 0x00 0x13 0x20 0x04 0x8c 0xce 0x08 0x00 // Ethernet header 0x45 0x00 0x00 0x38 0x72 0xdb 0x00 0x00 0xff 0x11 0xa9 0x31 0xc0 0xa8 0xfe 0x03 0xe0 0x00 0x00 0xfb // IP header 0x14 0xe9 0x14 0xe9 0x00 0x24 0x95 0x79 // UDP header 0x00 0x00 0x00 0x00 0x00 0x01 0x00 0x00 0x00 0x00 0x00 0x00 // DNS header 0x04 0x6a 0x75 0x6e 0x6b 0x05 0x6c 0x6f 0x63 0x61 0x6c 0x00 0x00 0x01 0x80 0x01 0x13 0x6c 0x5c 0xf9 // DNS question

sent by embedded device 0x01 0x00 0x5e 0x00 0x00 0xfb 0x00 0x13 0x20 0x04 0x8c 0xcf 0x08 0x00 // Ethernet header 0x45 0x00 0x00 0x42 0x00 0x05 0x00 0x00 0xff 0x11 0x1b 0xec 0xc0 0xa8 0xfe 0x15 0xe0 0x00 0x00 0xfb // IP header 0x14 0xe9 0x14 0xe9 0x00 0x2e 0x52 0x18 // UDP header 0x00 0x00 0x84 0x00 0x00 0x00 0x00 0x01 0x00 0x00 0x00 0x00 // DNS header 0x04 0x6a 0x75 0x6e 0x6b 0x05 0x6c 0x6f 0x63 0x61 0x6c 0x00 0x00 0x01 0x80 0x01 0x00 0x00 0x00 0x78 0x00 0x04 0xc0 0xa8 0xfe 0x15 // DNS answer RR


This does not work!

received by embedded device from MacBook OS 10.4.10 0x01 0x00 0x5e 0x00 0x00 0xfb 0x00 0x17 0xf2 0xce 0x65 0xdd 0x08 0x00 // Ethernet header 0x45 0x00 0x00 0x38 0x3b 0xba 0x00 0x00 0x01 0x11 0xde 0x50 0xc0 0xa8 0xfe 0x06 0xe0 0x00 0x00 0xfb // IP header 0xc2 0x07 0x14 0xe9 0x00 0x24 0xdf 0xc6 // UDP header 0x58 0xda 0x01 0x00 0x00 0x01 0x00 0x00 0x00 0x00 0x00 0x00 // DNS header 0x04 0x6a 0x75 0x6e 0x6b 0x05 0x6c 0x6f 0x63 0x61 0x6c 0x00 0x00 0x01 0x00 0x01 0x0a 0x5f 0xb3 0x95 // DNS question

sent by my embedded device 0x01 0x00 0x5e 0x00 0x00 0xfb 0x00 0x13 0x20 0x04 0x8c 0xcf 0x08 0x00 // Ethernet header 0x45 0x00 0x00 0x42 0x00 0x04 0x00 0x00 0xff 0x11 0x1b 0xed 0xc0 0xa8 0xfe 0x15 0xe0 0x00 0x00 0xfb // IP header 0x14 0xe9 0x14 0xe9 0x00 0x2e 0x52 0x18 // UDP header 0x58 0xda 0x84 0x00 0x00 0x00 0x00 0x01 0x00 0x00 0x00 0x00 // DNS header 0x04 0x6a 0x75 0x6e 0x6b 0x05 0x6c 0x6f 0x63 0x61 0x6c 0x00 0x00 0x01 0x80 0x01 0x00 0x00 0x00 0x78 0x00 0x04 0xc0 0xa8 0xfe 0x15 // DNS answer RR


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