"Share A Public IP address" Apple Utility Internet Connection

After following advice in another thread I've gotten rid of some home network problems that started dogging me last Friday. I got rid of a Netgear router that was evidently causing IP problems with the Extreme.
I've had to re-set the Extreme and now I am wondering if I want to under the Internet Connection Tab of the Airport Utility set "Connection Sharing" to "Share a public IP address"?
I am now using the Extreme (N only) as a router, and have it feeding an Express(G only), a Netgear switch and two hard wired/Ethernet connected desktops.
Thanks for any advice is one way or the other more secure from the outside world. I do have the Apple Firewall on my computer on.

Unfortunately, you will need to "hard reset" your AirPort Express to clear out the old and conflicting settings on the device.
To do that, hold in the reset button until the amber light begins to blink more quickly and keep holding another 4-5 seconds when this occurs, then release the reset button and the AirPort Express will restart. You should have a slow blinking amber light after 40-45 seconds. That is your signal that the Express can be reconfigured as you had it originally.
Since you are effectively trying to run two routers, both handling DHCP on your network, you may need to keep an eye on things. Even if you avoid the IP address conflicts, you will have to deal with a Double NAT error on your network, which can slow communications between devices (and the Internet).

Similar Messages

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    For the sake of posterity, here's the guide! :-)
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    My setup is based on an AirPort Extreme access point WiFi network. The AirPort shares a hard drive, and a number of Windows clients connect to the network. One of these, a Windows 7 machine, has a USB mobile broadband dongle which I also wanted to share with the network.
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    Set the AirPort to the network address used by ICS, namely 192.168.137.xyz. Note that the AirPort does not allow a beginning address below 2:
    4. Obtain the AirPort's MAC addresses
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    5. Fix the AirPort IP addresses to prevent clashing with ICS
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    If your AirPort is sharing a connection on its WAN port, choose Share a public IP address, otherwise choose Distribute a range of IP address. In the latter case the NAT tab disappears:
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    Your AirPort configuration is now complete and you can push the Update button. Once your AirPort has rebooted, its network will be fully operational.
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    Right-click the connection you want to share > Properties > Sharing and configure as follows (you may find the other settings also useful but they're not covered here):
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    Windows Network Profiles
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    As Windows recognises networks, it applies their assigned profiles which add or remove sets of restrictions wrt. network discovery, file & printer sharing and so on. The amount of ICS configuration data that can be included with AirPort DHCP information is limited and in some instances this interferes with how Windows recognises networks.
    It seems that Windows recognises a network once a default router has been configured for it. Following are some known scenarios with fixes for each, based on that principle.
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    If you want to remove this unidentified network/router entry, execute the following from the command line with Administrator privileges:
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    To restore the ICS router entry, execute the following from the command line with Administrator privileges:
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  • Wireless works in Bridge mode but refuses in Share a Public IP

    This might seem like the easiest problem, but after searching the forum for ages I am still clueless.
    I connect to the internet by plugging the ethernet cable straight into the wall. Living in a student flat connecting through the uni's network. MAC-address is not required to log on. In order to access the internet however, username and password is required at a greeting/log on page.
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    I've been trying a few different setups and the only one that works is using the AE in bridge mode. I want to have it set up to share a public IP but nothing seems to work. Although the router gets an IP assigned and so does the laptop (the AE seems to communicate with the uni network, and the laptop communicates with the AE) internet can't be accessed by the laptop.
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    Thanks!

    Welcome to the discussions!
    I've been trying a few different setups and the only one that works is using the AE in bridge mode. I want to have it set up to share a public IP but nothing seems to work. Although the router gets an IP assigned and so does the laptop (the AE seems to communicate with the uni network, and the laptop communicates with the AE) internet can't be accessed by the laptop.
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    Message was edited by: Bob Timmons

  • What is the difference between Bridge Mode and sharing a public ip address?

    Hello,
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    "...share a public ip address..." enables the DHCP/NAT service on the Time Capsule.
    "...bridge mode..." disables the DHCP/NAT service on the Time Capsule.

  • Can I use Time Capsule to share a public ip within a network with DHCP enabled?

    Hi I have a router with 8 public ip's which is doing DHCP for the public ip's I own. What I am trying to do is to give a static public IP to my Time Capsule and then the time capsule should create another network (both wired and wireless) with private IP (eg. 192.168.1.xxx) and do DHCP to the connected to time capsule devices.
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    I am assuming that the static IP address that you are attempting to assign the WAN-side of the Time Capsule is one of the eight Public IP addresses available to you ... correct?
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  • Internet connection dropping out throughout day; problem NOT with provider

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    Connection Sharing: Share a Public IP address
    DHCP Beginning Address: 10.0.1.2
    Ending Address: 10.0.1.200
    DHCP Lease: 4 hours
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    Thank you!

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    8/22/08 7:15:31 AM kernel Darwin Kernel Version 9.4.0: Mon Jun 9 19:30:53 PDT 2008; root:xnu-1228.5.20~1/RELEASE_I386
    8/22/08 7:15:31 AM kernel standard timeslicing quantum is 10000 us
    8/22/08 7:15:31 AM kernel vmpagebootstrap: 972190 free pages and 76386 wired pages
    8/22/08 7:15:31 AM kernel migtable_maxdispl = 79
    8/22/08 7:15:31 AM kernel 98 prelinked modules
    8/22/08 7:15:31 AM kernel AppleACPICPU: ProcessorApicId=0 LocalApicId=0 Enabled
    8/22/08 7:15:31 AM kernel AppleACPICPU: ProcessorApicId=1 LocalApicId=1 Enabled
    8/22/08 7:15:31 AM kernel Loading security extension com.apple.security.TMSafetyNet
    8/22/08 7:15:31 AM kernel calling mpopolicyinit for TMSafetyNet
    8/22/08 7:15:31 AM kernel Security policy loaded: Safety net for Time Machine (TMSafetyNet)
    8/22/08 7:15:31 AM kernel Loading security extension com.apple.nke.applicationfirewall
    8/22/08 7:15:31 AM kernel Loading security extension com.apple.security.seatbelt
    8/22/08 7:15:31 AM kernel calling mpopolicyinit for mb
    8/22/08 7:15:31 AM kernel Seatbelt MACF policy initialized
    8/22/08 7:15:31 AM kernel Security policy loaded: Seatbelt Policy (mb)
    8/22/08 7:15:31 AM kernel Copyright (c) 1982, 1986, 1989, 1991, 1993
    8/22/08 7:15:31 AM kernel The Regents of the University of California. All rights reserved.
    8/22/08 7:15:31 AM kernel MAC Framework successfully initialized
    8/22/08 7:15:31 AM kernel using 16384 buffer headers and 4096 cluster IO buffer headers
    8/22/08 7:15:31 AM kernel devfsmakenode: not ready for devices!
    8/22/08 7:15:31 AM kernel IOAPIC: Version 0x20 Vectors 64:87
    8/22/08 7:15:31 AM kernel ACPI: System State [S0 S3 S4 S5] (S3)
    8/22/08 7:15:31 AM kernel mbinit: done
    8/22/08 7:15:31 AM kernel Security auditing service present
    8/22/08 7:15:31 AM kernel BSM auditing present
    8/22/08 7:15:31 AM kernel rooting via boot-uuid from /chosen: 419B2954-20DC-3880-AFEB-448924F9BE09
    8/22/08 7:15:31 AM kernel Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
    8/22/08 7:15:31 AM kernel FireWire (OHCI) TI ID 8025 built-in now active, GUID 001d4ffffe5f8d30; max speed s800.
    8/22/08 7:15:31 AM kernel Got boot device = IOService:/AppleACPIPlatformExpert/PCI0/AppleACPIPCI/SATA@1F,2/AppleICH8AHCI/PR T0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorageD river/ST9160823AS Media/IOGUIDPartitionScheme/Customer@2
    8/22/08 7:15:31 AM kernel BSD root: disk0s2, major 14, minor 2
    8/22/08 7:15:31 AM kernel Jettisoning kernel linker.
    8/22/08 7:15:31 AM kernel Resetting IOCatalogue.
    8/22/08 7:15:31 AM kernel GFX0: family specific matching fails
    8/22/08 7:15:31 AM kernel Matching service count = 1
    8/22/08 7:15:31 AM kernel Matching service count = 2
    8/22/08 7:15:31 AM kernel Matching service count = 2
    8/22/08 7:15:31 AM kernel Matching service count = 2
    8/22/08 7:15:31 AM kernel Matching service count = 2
    8/22/08 7:15:31 AM kernel Matching service count = 2
    8/22/08 7:15:31 AM kernel Previous Shutdown Cause: 5
    8/22/08 7:15:31 AM kernel NVDANV50HAL loaded and registered.
    8/22/08 7:15:31 AM kernel ath_attach: devid 0x24
    8/22/08 7:15:31 AM kernel GFX0: family specific matching fails
    8/22/08 7:15:32 AM kernel Override HT40 CTL Powers. EEPROM Version is 14.4, Device Type 5
    8/22/08 7:15:33 AM kernel mac 12.10 phy 8.1 radio 12.0
    8/22/08 7:15:33 AM kernel CSRHIDTransitionDriver::start []
    8/22/08 7:15:34 AM kernel CSRHIDTransitionDriver::switchToHCIMode legacy
    8/22/08 7:15:36 AM bootlog[38] BOOT_TIME: 1219414527 0
    8/22/08 7:15:36 AM rpc.statd[19] statd.notify - no notifications needed
    8/22/08 7:15:37 AM com.apple.launchd[1] (com.apple.distccdConfigd[32]) Exited with exit code: 255
    8/22/08 7:15:37 AM DirectoryService[34] Launched version 5.4 (v514.21)
    8/22/08 7:15:37 AM fseventsd[28] bumping event counter to: 0x2e4ba71 (current 0x0) from log file '0000000002e4b394'
    8/22/08 7:15:37 AM mDNSResponder mDNSResponder-171.4 (Apr 20 2008 11:59:52)[23] starting
    8/22/08 7:15:38 AM kernel yukon: Ethernet address 00:1b:63:a2:29:d1
    8/22/08 7:15:38 AM kernel AirPort_Athr5424ab: Ethernet address 00:1c:b3:c0:f5:49
    8/22/08 7:15:38 AM /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[24] Login Window Application Started
    8/22/08 7:15:38 AM com.apple.SecurityServer[20] Entering service
    8/22/08 7:15:38 AM /usr/sbin/ocspd[62] starting
    8/22/08 7:15:39 AM kernel 11D beacon causing regdomain change to CC 840
    8/22/08 7:15:39 AM kernel en1: 802.11d country code set to 'US'.
    8/22/08 7:15:40 AM kernel en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 149 153 157 161 165
    8/22/08 7:15:39 AM configd[36] setting hostname to "Macintosh-3.local"
    8/22/08 7:15:44 AM kernel USBF: 16.757 AppleUSBHubPort: Port 1 of Hub at 0x1a000000 about to terminate a busy device (IOUSBCompositeDevice) after waiting 10 seconds
    8/22/08 7:15:44 AM kernel USBF: 17. 59 CSRHIDTransitionDriver[0x723ca80](IOUSBCompositeDevice) GetFullConfigDescriptor(0) returned NULL
    8/22/08 7:15:44 AM kernel CSRHIDTransitionDriver... done
    8/22/08 7:15:46 AM kernel AppleYukon2: 00000000,00000000 sk98osx_dnet - recovering from missed interrupt
    8/22/08 7:15:46 AM org.ntp.ntpd[14] Error : nodename nor servname provided, or not known
    8/22/08 7:15:46 AM ntpdate[70] can't find host time.apple.com
    8/22/08 7:15:46 AM ntpdate[70] no servers can be used, exiting
    8/22/08 7:15:53 AM kernel AppleYukon2: 00000000,00000000 sk98osx_dnet - recovering from missed interrupt
    8/22/08 7:15:53 AM kernel AirPort: Link Up on en1
    8/22/08 7:15:54 AM kextd[10] writing kernel link data to /var/run/mach.sym
    8/22/08 7:16:02 AM loginwindow[24] Login Window Started Security Agent
    8/22/08 7:16:02 AM SecurityAgent[88] User info context values set
    8/22/08 7:16:02 AM SecurityAgent[88] Login Window done
    8/22/08 7:16:02 AM loginwindow[24] Login Window - Returned from Security Agent
    8/22/08 7:16:02 AM loginwindow[24] USER_PROCESS: 24 console
    8/22/08 7:16:02 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[81]) Exited: Terminated
    8/22/08 7:16:02 AM com.apple.launchctl.Aqua[91] launchctl: Please convert the following to launchd: /etc/machinit_peruser.d/com.adobe.versioncueCS3.monitor.plist
    8/22/08 7:16:02 AM com.apple.launchctl.Aqua[91] launchctl: Please convert the following to launchd: /etc/machinit_peruser.d/RemoteUI.plist
    8/22/08 7:16:03 AM com.apple.launchd[66] (0x101260.VersionCueCS3monitor) Failed to check-in!
    8/22/08 7:16:03 AM /System/Library/CoreServices/coreservicesd[44] SFLSharePointsEntry::CreateDSRecord: dsCreateRecordAndOpen(Mark's Public Folder) returned -14135

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