Connecting a modem, problem solving PPPOA

Hi everyone,
I've purchased the Airport Extreme (dual) and I've also got a new Broadband Package on the way due to my last ISP being a failure!
The ISP is PPPOA, as was my last one, and as far as I can see the Airport Extreme has no support for this. Only PPPOE.
I also have a Netgear DG834G, which I was planning to use as a modem, but since the airport can't support PPPOA, that's out of the window, right?
1. Will using the Airport as a bridge and connecting to it cause any problems (speed decreases etc) with the internet?
2. Is is best if I purchase a Vigor 120 which will provide a PPPOA to PPPOE bridge, therefore solving the problem? Or is this not needed and will provide no advantage?
Any ideas welcome, got a few days to get it solved!
Thanks,
Ste.

The ISP is PPPOA, as was my last one, and as far as I can see the Airport Extreme has no support for this. Only PPPOE.
That is correct. The AirPorts do not support PPPoA to provide user credentials to the ISP. You would require another device: modem, another router, or your computer that support PPPoA to provide these.
I also have a Netgear DG834G, which I was planning to use as a modem, but since the airport can't support PPPOA, that's out of the window, right?
Not necessarily. You could connect the AirPort Extreme Base Station (AEBS) directly to one of the Netgear's LAN ports with the AEBS configured as a bridge. This would allow the Netgear to provide both NAT & DHCP services for the entire network.
1. Will using the Airport as a bridge and connecting to it cause any problems (speed decreases etc) with the internet?
No, as a bridge, the AEBS would become a "passive" device.

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WiFi connection problem solved

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Same here on a Vodafone PocketWiFi 2.
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"Please connect to the internet-"problem solved by the latest Muse-update

Hi staff,
I'm happy to tell you that the former problem with the error message "Please connect to the internet…" when trying to start Muse is solved now by the latest update. At that time I talked to James Boag, he assumed Muse might not recognize my USB-modem (and I should try a different access point, which I didn't) but this is not an issue any more. When I launched Muse recently, it updated automatically and then started with no problems.
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Hi arrakis13,
I’m afraid I cannot really help you.
I did not make any changes on my running system except that I’m on 10.8 Mountain Lion (upgraded from 10.6.8., no Lion in between), but this did not change the behavior of Muse at first. Only the update, which started automatically when I launched the app on August, 21, (still the trial version) caused the difference.
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Regards
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Am 03.09.2012 um 04:18 schrieb arrakis13 <[email protected]>:
Re: "Please connect to the internet…"problem solved by the latest Muse-update
created by arrakis13 in Adobe Muse Bugs - View the full discussion
This is still happening for me. I downloaded the beta yesterday and am on 10.7. I run software update but Muse is not showing up as having an update. My firewall is not running. Any suggestions on how I can get this running would be much appreciated.
Please let me know.
Thanks!!
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Can't connect with modem through e2500 router

I have an old Speedstream 5100 modem hooked to my e2500 router. Everything works well except if for some reason my modem disconnects from ISP I can not log into it through the route to reconnect it. I must plug a direct cable into modem from computer run connect script then plug modem back into router all is fine again.
Any ideas why connecting to modem through router is blocked?
Thnaks,
Al
Solved!
Go to Solution.

al_mathews wrote:
My Speedstream only has one Ethernet connection so I didn't realize that it looked like a router to the local network. I changed the mode to bridge on the Speedstream and setup PPoE on e2500 and reconnected to ISP on e2500 setup screen. That may solve the problem of reconnecting since now it is managed on the e2500.
One thing I now see is since I left the modem IP set to 192.168.0.X I can't get to it at all through the e2500. Is that because my DHCP in e2500 is setup with 192.168.1.X IP range so modem isn't addressed in my network? If I hook directly to Speedstream and change IP to 192.168.1.X will it become visible on local network?
You cannot access the modem anymore while you have an active PPPoE connection. For PPPoE the E2500 won't need an IP address from the modem thus it doesn't do DHCP on the WAN port and thus it never sees it. When you try to access 192.168.0.* addresses the E2500 will route it through the PPP tunnel to the ISP.
If you hook your computer directly to the SpeedStream it should automatically pick up a DHCP address (assuming the computer is still running on DHCP and not with a static IP and the SpeedStream does not automatically disable the DHCP server in bridge mode). If you have set up a static IP on the computer you have to change the IP address to a 192.168.0.* address.

CS-15 Modem Problem

Hello,
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On the other hand, everything runs very well on another laptop with windows XP - the program itselfs creates a profile, I only have to click connect after instalation.
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Well I have little different problem, with Nokia cs-15 and the network provider is DNA in Finland,
Neither does Nokia nor DNA is willing to help, those idiots just telling me to replace my brand new computer from win 7, 64 bit processor to something else like 32 bit or vista or like that, but they do not want to solve the problem.
Nokia, DNA and finnish people are IMPOTENT when it comes to problem solving, even in police and immigration i face so much problem and now being summer, forget about it, for 3 months, no body will be there in any of the government or private offices, you basically have to face curfew in finland, in summer. nothing gets done. and in winter, they are sad and depressed and drunk and in summer they take vacation for 3 months.
unreal.

Network Connection - could not find a PPPoE server

This question is different from other similar ones I've read.
I have a Windows box that I use every day, connected to DSL by ethernet to a D-Link modem/router. I frequently connect/disconnect my MacBook Pro 10.6.8 and, until recently, all was well. It would be online as soon as it booted up. Now, while my Windows machine still gets online fine, MacBook says my ethernet is connected, but I can't get online. My DHCP is fine, but when I click the connect button for PPPoE, I get the message "Network Connection - could not find a PPPoE server". I didn't look but I'm assuming it was using both DHCP and PPPoE when it was working properly.
Took it to the shop and as soon as they plugged it in, it was online, with both the DHCP and PPPoE working.
My ISP says it must be a driver issue for PPPoE, something to do with the configuration. So 2 shops say they can only fix it by coming to my home, instead of me taking it in to them. Are they correct, or how can I fix it myself, bearing in mind that I'm fairly new with this?

Hi Grant,
Got a different person at my ISP today, she says I have a dynamic IP address, so both my computers only need DHCP. We walked through my Windows machine network screen and it is definitely set up with just DHCP (just like the Mac). But she couldn't tell me why Windows was working and Mac wasn't. Which makes me wonder why the Apple shop told me to click on connect PPPoE!
She said when I took my Mac to the shop and both DHCP and PPPoE were showing as active, only the DHCP was needed and actually doing anything. And she couldn't tell me why I couldn't just take my Mac plus the router into the shop and get it set up there.
My UN and PW were 'admin', and I changed them long ago. Your instructions were identical to the router manual, but she couldn't tell me how to change them back to my chosen names if I followed those instructions. She also said a new router might fix the problem.
Everybody seems to have different ideas (in addition to the 2 sales pitches), and I'll admit that I'm concerned that if I re-set the router it might mess up Windows so it doesn't work either. So I'm frozen!

Problem with PPPoE

Hi!
I am trying to get my ADSL connection working. It looks like this: there is a WAN cable that comes to modem and there are few ethernet outputs from the modem (it is PPPoE). One output is connected to the WiFi router and it works fine. When I try to connect computer directly to modem, connection does not work on Linux (it was working on Windows but Windows is out now). I have tried straight and crossed-over cables and neither NetworkManager nor rp-pppoe does not want to work. Log says that pppoe discovery packet is sent but there is no response.
Here is log from pppoe-start (I have configured it with pppoe-setup).
Apr 18 20:07:15 nonamed pppd[2849]: pppd 2.4.5 started by user, uid 0
Apr 18 20:07:15 nonamed systemd-sysctl[2852]: Duplicate assignment of kernel/sys
rq in file '/usr/lib/sysctl.d/50-default.conf', ignoring.
Apr 18 20:07:15 nonamed pppd[2849]: Using interface ppp0
Apr 18 20:07:15 nonamed pppd[2849]: Connect: ppp0 <--> /dev/pts/3
Apr 18 20:07:15 nonamed pppd[2849]: Modem hangup
Apr 18 20:07:15 nonamed pppd[2849]: Connection terminated.
Apr 18 20:07:15 nonamed pppd[2849]: Exit.
Apr 18 20:07:15 nonamed pppoe-connect: PPPoE connection lost; attempting re-connection.
And here is from NetworkManager
Apr 18 20:10:00 nonamed pppd[2923]: Plugin rp-pppoe.so loaded.
Apr 18 20:10:00 nonamed pppd[2923]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.5
Apr 18 20:10:00 nonamed NetworkManager[2872]: Plugin rp-pppoe.so loaded.
Apr 18 20:10:00 nonamed NetworkManager[2872]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.5
Apr 18 20:10:00 nonamed pppd[2923]: Plugin /usr/lib/pppd/2.4.5/nm-pppd-plugin.so loaded.
Apr 18 20:10:00 nonamed NetworkManager[2872]: Plugin /usr/lib/pppd/2.4.5/nm-pppd-plugin.so loaded.
Apr 18 20:10:01 nonamed pppd[2923]: pppd 2.4.5 started by root, uid 0
Apr 18 20:10:20 nonamed NetworkManager[2872]: <info> (enp2s0): IP6 addrconf timed out or failed.
Apr 18 20:10:20 nonamed NetworkManager[2872]: <info> Activation (enp2s0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Apr 18 20:10:20 nonamed NetworkManager[2872]: <info> Activation (enp2s0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Apr 18 20:10:20 nonamed NetworkManager[2872]: <info> Activation (enp2s0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Apr 18 20:10:30 nonamed NetworkManager[2872]: <warn> pppd timed out or didn't initialize our dbus module
Apr 18 20:10:30 nonamed NetworkManager[2872]: <info> (enp2s0): device state change: ip-config -> failed (reason 'ppp-failed') [70 120 14]
Apr 18 20:10:30 nonamed NetworkManager[2872]: <warn> Activation (enp2s0) failed for connection 'DSL Connection'
Apr 18 20:10:30 nonamed NetworkManager[2872]: <info> (enp2s0): device state change: failed -> disconnected (reason 'none') [120 30 0]
Apr 18 20:10:30 nonamed NetworkManager[2872]: <info> (enp2s0): deactivating device (reason 'none') [0]
# pppoe-discovery -I enp2s0
Timeout waiting for PADO packets
I have no idea what is wrong. Is there any hope to solve it?

You say you can connect the wifi router to the modem? Most probably the modem handle the pppoe stuff itself and give an address to the computer by dhcp.
Modem does not handle pppoe stuff itself. WiFi router is configured to use PPPoE with login and password and then makes WLAN I can connect. Dhcpcd can't find any dhcp server on the ethernet.
# dhcpcd enp2s0
dhcpcd[3182]: version 5.6.7 starting
dhcpcd[3182]: enp2s0: carrier acquired
dhcpcd[3182]: enp2s0: carrier lost
dhcpcd[3182]: enp2s0: waiting for carrier
dhcpcd[3182]: enp2s0: carrier acquired
dhcpcd[3182]: enp2s0: sending IPv6 Router Solicitation
dhcpcd[3182]: enp2s0: sendmsg: Cannot assign requested address
dhcpcd[3182]: enp2s0: broadcasting for a lease
dhcpcd[3182]: enp2s0: sending IPv6 Router Solicitation
dhcpcd[3182]: enp2s0: sending IPv6 Router Solicitation
dhcpcd[3182]: enp2s0: sending IPv6 Router Solicitation
dhcpcd[3182]: enp2s0: no IPv6 Routers available
dhcpcd[3182]: timed out

Broadband connection and speed problems

Hi,
On Wednesday morning my broadband connection went down and could not reconnect from 600am til 700pm. It did manage to get a connection to stay up at around 900pm, but since then the connection has dropped about four times a day.
I have checked my equipment, wiring etc, connected directly to the test socket, using a new ADSL microfilter etc etc. I have also checked for known problems in my area and have done some quiet call tests(17070).
There are apparently no problems in my area, but a couple of the quiet call tests were crackly.
Since last night (Friday) at around 900pm the connection has managed to stay up but my connection speeds, both up and down are much much lower than they used to be.
Since Wednesday night I have performed some BT speedtests.
D/L Profile for my line is - 17.64 Mbps, but actual speed currently varies between around 8 and 11 Mbps.
U/L Profile for my line is - 0.83 Mbps, but speed currenty varies between 0.01 and 0.3 Mbps.
Before Wednesday, my download speeds were typically 16-17Mbps and upload speeds were typically 0.8Mbps.
With very little variation.
I have included some stats from my BT HH3...
Wednesday nights ADSL Line status, after I managed to get a connection to stay up. below;
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 04:59:49
Downstream: 18.65 Mbps
Upstream: 443.9 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.5 Annex A
Latency type: Fast
Noise margin (Down/Up): 4.9 dB / 26.4 dB
Line attenuation (Down/Up): 11.1 dB / 5.3 dB
Output power (Down/Up): 20.1 dBm / 12.9 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 758 / 36
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 23957 / 6
Error Seconds (Local/Remote): 300 / 4
Current ADSL line status. After the line being up for 17 hours below;
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 17:17:36
Downstream: 19.52 Mbps
Upstream: 443.9 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.5 Annex A
Latency type: Fast
Noise margin (Down/Up): 3.2 dB / 28.1 dB
Line attenuation (Down/Up): 11.0 dB / 5.2 dB
Output power (Down/Up): 20.2 dBm / 12.2 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 133 / 36
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 636 / 9
Error Seconds (Local/Remote): 117 / 4
One thing that stands out is the Noise Margin of 4.9dB and now 3.2dB. I gather that these values are on the low side. Is 3.2dB acceptable?
I assume my line attenuation values are low as I live very close to my local exchange. I assume that these values are good.
There are some CRC HEC and Error Seconds values. I must admit that I dont fully understand these but I assume these are not good.
One other thing worth mentioning is that the phone cable to my property comes along my front wall over from a neighbouring property. Whilst checking this cable this morning in the daylight, I have noticed that someone, most probably my neighbour, has pulled the cable way from its fixing on the wall in order to put a fence post up on the wall.
The fence post has been there for a few months, with no apparent affect ro my phone and broadband, but I'm concerned that this could have damaged the cable, splitting the shielding or breaking a wire in the cable, or perhaps loosened the connectors to the juntion box it is connected to on the neighbours wall.
Could damage to the cable be the cause of my connection and speed problems?
Also, is it possible that my BTHH3 is faulty?
Any advice would be very welcome.
Thanks
Solved!
Go to Solution.

A little more information.
I have noticed that on a number of occasions when making or receiving voice calls, the broadband connection completely drops. It doesnt happen on all calls, and doesnt seem to happen when just going 'offhook' and listening to a dialling tone.
There is a definite crackle and hiss on most of the voice calls. But only seems to be audible on the home phone.
After a little browsing, I came upon a logging program "Routerstatshub". When I leave this running it logs changes to ADSL stats.
Looking at the logs, I've noticed that when making voice calls, the upstream noise margin always seems to drop considerably, sometimes down to 0dB.
On some calls, both upstream and downstream noise margin drop to 0dB and the broadband connection drops.
I have also noticed that upstream line attenuation increases from around 5dB to around 28dB every hour or so. This doesnt appear to coincide with the voice calls.
CRC and HEC error increase dramatically at the same time as the noise margin changes. HEC goes up by 10s of thousands.
I'm still directly connected into the mastersocket with a new microfilter and no extension cable.
By the way, my connection speeds went down to an all time low yesterday , 1.7Mbps down.
I have now replaced my DECT phone with a corded phone and will make some more voice calls to see if that makes any difference.
Any ideas about what the problem could be would be greatly appreciated.

HP 250 G3 can not connect to modem when it returns from sleep

Hi, Ralink RT3290 Wifi adapter driver is loaded on my HP 250 G3. I can connect modem and internet. I can download and upload data from internet properly. However, if I put my PC on sleep, after waking up, PC cannot connect to modem. At every turn, to solve this problem, I turn off and turn on wireles adapter. Then, PC can connect modem and work properly. How can I solve this problem. Is there any problem on my wifi driver or something else? Please help me.

Thanks. How long is the delay?
I've had that on my Late 2007 MBP since Day One but the delay is usually only seconds--no more that three on a bad day.
I think its to do with waking from sleep. The standard sleep mode in the MBP is :Safe Sleep" where the computer writes the contents of RAM to the hard drove before sleeping as a safety net against the battery running dry while the computer sleeps. If the computer has to read this spot of info before completely awaking.
When I first purchased my MacBook Pro, a month ago, it would connect immediately upon waking from sleep. Now, for some unknown reason, it will not
That could be the result of now having more to write before sleep than when the computer was new because it's been in use a while and had other software added. For a test, see if the delay is reduced if you quit all open apps before sleep.
Having DashBoard active could also be a contibutor becasue many widgets have to "phone phone" for updates and could be preempting the connection opening for regular use. I use this widget:
http://www.apple.com/downloads/dashboard/status/dashquit_berenguierduncan.html
to shut down Dashboard without having to restart the computer. It's a carry-over from the old days of slower computers and expensive RAM but i find it still useful. This does not harm Dashboard or make if unavailable later. It 's basically the "off switch" that DashBoard should have been granted.
If, after quitting active programs and Dashboard, the delay is still more than a few seconds, then something else is at play. As the computer is new and under warranty, I would let an Apple Store look at it.

I am trying to connect to my friend's wifi, i have a very strong signal indicated on my ipad, but cannot connect to the internet. Yesterday i connected without any problem, can anybody tell me why i cannot connect today?

i am trying to connect to my friend's wifi, i have a very strong signal indicated on my ipad, but cannot connect to the internet. Yesterday i connected without any problem, can anybody tell me why i cannot connect today?

Some things to try first:
1. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
3. Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
4. Go into your router security settings and change from WEP to WPA with AES.
5. Renew IP Address: (especially if you are droping internet connection)
    •    Launch Settings app
    •    Tap on Wi-Fi
    •    Tap on the blue arrow of the Wi-Fi network that you connect to from the list
    •    In the window that opens, tap on the Renew Lease button
6. Potential Quick Fixes When Your iPad Won’t Connect to Your Wifi Network
http://ipadinsight.com/ipad-tips-tricks/potential-quick-fixes-when-your-ipad-won t-connect-to-your-wifi-network/
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iOS 6 Wifi Problems/Fixes
Wi-Fi Fix for iOS 6
https://discussions.apple.com/thread/4823738?tstart=240
How To: Workaround iPad Wi-Fi Issues
http://www.theipadfan.com/workaround-ipad-wifi-issues/
Another Fix For iOS 6 WiFi Problems
http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
Wifi Doesn't Connect After Waking From Sleep - Sometimes increasing screen brightness prevents the failure to reconnect after waking from sleep. According to Apple, “If brightness is at lowest level, increase it by moving the slider to the right and set auto brightness to off.”
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
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http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
~~~~~~~~~~~~~~~~~~~~~~~
How to Boost Your Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Boost-Your-Wi-Fi-Signal.h tm
Troubleshooting a Weak Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/Troubleshooting-A-Weak-Wi-Fi-Sig nal.htm
How to Fix a Poor Wi-Fi Signal on Your iPad
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Fix-A-Poor-Wi-Fi-Signal-O n-Your-iPad.htm
iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Connect iPad to Wi-Fi (with troubleshooting info)
http://thehowto.wikidot.com/wifi-connect-ipad
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
Wi-Fi or Bluetooth settings grayed out or dim
http://support.apple.com/kb/TS1559
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

I have a new time capsule (replace my old time capsule). I want to erase my old one. My computer does not see the old one anymore, how do I connect it (the old TC is not connected to modem)

I have a new time capsule (replace my old time capsule). I want to erase my old one. My computer does not see the old one anymore, how do I connect it (the old TC is not connected to modem). I want to erase it and then use it as either a second hard drive (sired/sirelesly?) or as a hard drive/bridge. So,
1. why doesn't my cmputer see the old TC
2 once i have solved that, how do I erase the old one
3. Can I use the old one as a supplemental hard drive
     a. wired?
     b. wirelessly?
4. Can I use the old one as a range extender?
I know .. a lot of questions but I would appreciate any help.
Thanks

sgetraer wrote:
I have a new time capsule (replace my old time capsule). I want to erase my old one. My computer does not see the old one anymore, how do I connect it (the old TC is not connected to modem). I want to erase it and then use it as either a second hard drive (sired/sirelesly?) or as a hard drive/bridge. So,
1. why doesn't my cmputer see the old TC
2 once i have solved that, how do I erase the old one
3. Can I use the old one as a supplemental hard drive
     a. wired?
     b. wirelessly?
4. Can I use the old one as a range extender?
I know .. a lot of questions but I would appreciate any help.
Thanks
1. Because it is either the same IP as the new one or hidden by being plugged in as a second router.
To access it, isolate one computer from the existing network and plug it directly by ethernet to a lan port of the TC. Use the erase function in the TC to remove all the content of the hard disk.
Then go to the internet tab, connection sharing and select off bridged. You can then reconnect the TC to the network.. and the computer as well. The TC will act as bridged device.. getting IP from the main router and should then appear correctly in Airport utility.
2. I covered in 1. But you just go in airport utility manual setup. disk, and you will see the erase function. You can also set it to bridge and leave the erase until you put it back in the network.. but be careful you erase the right one.
3. You can use the old TC via wired or wireless.. although I would always stick to wired connection if possible. Speed on wireless is 10x worse than wired.
Also note the reliability goes down dramatically after 2 years.. a series 1 3 years old or more is ebay fodder unless you want to repair it. Do not trust vital data to it.. when it dies you will have issues recovering it.
4. Yes, all apple routers will function as wireless extenders. when you do that the ethernet ports turn off so it becomes a purely wireless device.. strange apple decision on what you want to use your TC for.

Connecting a modem, problem solving PPPOA

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