Problem with Interner Sharing using Leopard

Question

Hello,
After upgrading to Leopard (10.5.1) the internet sharing feature stopped working.
I used to share my 3G modem connection over the Airport. But now, the devices I connect to my MacBook using “Internet Sharing” won’t access the Net.
I noticed two things (perhaps unrelated); first, upon activation of the Internet sharing, the natd process goes to 99% and stays there.
Second, although I can always ping the gateway from the other devices (after they get ip, gateway and dns using DHCP), I can only ping the connected devices form the gateway for about 5 seconds, after that, any device connected to my Mac won’t respond to ping.
During those 5 seconds all other devices are able to access the internet, after that, I have to restart the Internet sharing to let other devices connect for another 5 seconds.
The gateway is a Macbook running 10.5.1 and the clients are an iMac intel and an iPhone.
This is the error I found on the console:
+12/14/07 10:06:35 PM com.apple.launchd[1] (com.apple.InternetSharing) Unknown key: SHAuthorizationRight+
Everything was working until I upgraded from 10.4 to 10.5 any hints on how to solve the problem will be appreciated.

Answer 1

Hello mreckhof
My firewall settings are:
Allow any incoming connections
the ipfw list shows:
65535 allow ip from any to any
The strange thing is that the connection works for about 5 seconds as soon as I enable internet sharing, after that, the devices stop accessing the net. The ping shows connectivity from the gateway to one of the devices but only for 5 seconds,
Here is the system.log
+Dec 15 11:48:46 SebKe com.apple.launchd[1] (com.apple.InternetSharing): Unknown key: SHAuthorizationRight+*<-- this looks suspicious---*
+Dec 15 11:48:47 SebKe named[1170]: starting BIND 9.4.1-P1 -c /etc/com.apple.named.conf.proxy -f+
+Dec 15 11:48:47 SebKe named[1170]: running+
+Dec 15 11:48:48 SebKe mDNSResponder[15]: getifaddrs ifa_netmask for vmnet8(7) Flags 8863 Family 2 192.168.94.1 has different family: 0+
+Dec 15 11:48:48 SebKe mDNSResponder[15]: getifaddrs ifa_netmask for vmnet1(8) Flags 8863 Family 2 192.168.200.1 has different family: 0+
+Dec 15 11:48:48 SebKe mDNSResponder[15]: Note: Frequent transitions for interface en1 (10.0.2.1); network traffic reduction measures in effect+
+Dec 15 11:48:48 SebKe mDNSResponder[15]: SetupAddr invalid sa_family 0+
+Dec 15 11:48:49 SebKe mDNSResponder[15]: getifaddrs ifa_netmask for vmnet8(7) Flags 8863 Family 2 192.168.94.1 has different family: 0+
+Dec 15 11:48:49 SebKe mDNSResponder[15]: getifaddrs ifa_netmask for vmnet1(8) Flags 8863 Family 2 192.168.200.1 has different family: 0+
+Dec 15 11:48:49 SebKe mDNSResponder[15]: Note: Frequent transitions for interface en1 (FE80:0000:0000:0000:0219:E3FF:FE00:B5A1); network traffic reduction measures in effect+ *<-- Could this be the problem?*
+Dec 15 11:48:49 SebKe mDNSResponder[15]: SetupAddr invalid sa_family 0+
+Dec 15 11:48:53 SebKe mDNSResponder[15]: getifaddrs ifa_netmask for vmnet8(7) Flags 8863 Family 2 192.168.94.1 has different family: 0+
+Dec 15 11:48:53 SebKe mDNSResponder[15]: getifaddrs ifa_netmask for vmnet1(8) Flags 8863 Family 2 192.168.200.1 has different family: 0+
+Dec 15 11:48:53 SebKe mDNSResponder[15]: SetupAddr invalid sa_family 0+
+Dec 15 11:49:23: --- last message repeated 1 time ---+
+Dec 15 11:49:28 SebKe kernel[0]: ath_newassoc:mac=00:1c:b3:3c:ee:b5 Caplag=0x0 Flags: SHORTGI+
+Dec 15 11:49:28 SebKe bootpd[1169]: can't open /etc/bootptab+
+Dec 15 11:49:28 SebKe bootpd[1169]: server name SebKe.local+
+Dec 15 11:49:28 SebKe bootpd[1169]: interface en1: ip 10.0.2.1 mask 255.255.255.0+
+Dec 15 11:49:28 SebKe bootpd[1169]: interface en1: ip 169.254.169.251 mask 255.255.0.0+
+Dec 15 11:49:28 SebKe bootpd[1169]: interface vmnet8: ip 192.168.94.1 mask 255.255.255.0+
+Dec 15 11:49:28 SebKe bootpd[1169]: interface vmnet1: ip 192.168.200.1 mask 255.255.255.0+
+Dec 15 11:49:28 SebKe bootpd[1169]: interface ppp0: ip 170.51.166.249 mask 255.255.0.0+
+Dec 15 11:49:28 SebKe bootpd[1169]: DHCP REQUEST [en1]: 1,0:1c:b3:3c:ee:b5 <iSebke>+
+Dec 15 11:49:30 SebKe named[1170]: client 10.0.2.7#5353: RFC 1918 response from Internet for 7.2.0.10.in-addr.arpa+
After this, the ping will stop reaching the other device.
The gateway ip is 10.0.2.1
+64 bytes from 10.0.2.7: icmp_seq=47 ttl=64 time=1.581 ms+
+64 bytes from 10.0.2.7: icmp_seq=48 ttl=64 time=1.687 ms+
+64 bytes from 10.0.2.7: icmp_seq=49 ttl=64 time=1.631 ms+
+64 bytes from 10.0.2.7: icmp_seq=50 ttl=64 time=1.684 ms+
+64 bytes from 10.0.2.7: icmp_seq=51 ttl=64 time=1.671 ms+
+64 bytes from 10.0.2.7: icmp_seq=52 ttl=64 time=1.656 ms+
+64 bytes from 10.0.2.7: icmp_seq=53 ttl=64 time=6.849 ms+ <-- After here it just stops responding
the time is also pretty bad
Message was edited by: sebke