Category:L2TP Handover: Difference between revisions
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The 'calling number' and 'called number' in the incoming call request are the SIM's ICCID. |
The 'calling number' and 'called number' in the incoming call request are the SIM's ICCID. |
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The two devices that I've been using -- a Vodafone (Huawei) K4505 and a Nokia E51 -- behave noticeably differently when it comes to PPP and particularly IPCP. |
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=Things to do= |
=Things to do= |
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Windows 7, and the Vodafone Mobile Broadband software (the Mac version works nicely with non-Vodafone SIMs, the Windows one doesn't, go figure) treat suitably capable 3G devices essentially as if they were Ethernet interfaces, rather than PPP devices. There's lots of interesting magic going on in there that I haven't figured out, but what they try to do is figure out a netmask and default gateway based on the IP address they're given. If you supply the second or third IP in a /30 for instance, they pick the other one as the default gateway. I want to see if and how this behaviour changes if the server end's IP address gets passed through correctly. |
Windows 7, and the Vodafone Mobile Broadband software (the Mac version works nicely with non-Vodafone SIMs, the Windows one doesn't, go figure) treat suitably capable 3G devices essentially as if they were Ethernet interfaces, rather than PPP devices. There's lots of interesting magic going on in there that I haven't figured out, but what they try to do is figure out a netmask and default gateway based on the IP address they're given. If you supply the second or third IP in a /30 for instance, they pick the other one as the default gateway. I want to see if and how this behaviour changes if the server end's IP address gets passed through correctly. |
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My Huawei K4505 doesn't offer a remote address if it doesn't get one from the peer. In this situation, Linux picks 10.64.64.64. My Nokia E51 offers 10.6.6.6 in this situation. |
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=PPP |
=PPP observations= |
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Microsoft's PPP implementations up to and including Vista still believe in classful addressing. If you don't want the PPP interface to be the default route, then if they are given a 'class A' address they assume a netmask of 255.0.0.0 and set a corresponding network route, similarly for class B and C addresses. Windows 7 has the option to disable this automatic classful route if you don't set the default route. Nice one Microsoft :-) |
Microsoft's PPP implementations up to and including Vista still believe in classful addressing. If you don't want the PPP interface to be the default route, then if they are given a 'class A' address they assume a netmask of 255.0.0.0 and set a corresponding network route, similarly for class B and C addresses. Windows 7 has the option to disable this automatic classful route if you don't set the default route. Nice one Microsoft :-) |
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