iPhone THE MISSING MANUAL - Cdn.oreilly.com

158
Managing Accounts
If you have more than one email account, you can turn them on and off at will.
You might deactivate one for awhile because, for example, you don’t plan to
do much traveling for the next month.
You can also delete an account entirely.
All of this happens at SettingsÆMail. When you see your list of accounts, tap
the one you want. At the top of the screen, you’ll see the On/Off switch, which
you can use to make an account dormant. And at the bottom, you’ll see the
Delete Account button.
If you have several accounts, which one does the iPhone use when you send mail
from within other programs—like when you email a photo from Photos or a link
from Safari?
It uses the default account, of course. You determine which one is the default
account in SettingsÆMail (scroll to the very bottom).
Virtual Private Networking (VPN)
The typical corporate network is guarded by a team of steely-eyed administrators
for whom Job Number One is preventing access by unauthorized
visitors. They perform this job primarily with the aid of a super-secure firewall
that seals off the company’s network from the Internet.
So how can you tap into the network from the road? Only one solution is
both secure and cheap: the Virtual Private Network, or VPN. Running a VPN
lets you create a super-secure “tunnel” from your iPhone, across the Internet,
and straight into your corporate network. All data passing through this tunnel
is heavily encrypted. To the Internet eavesdropper, it looks like so much
undecipherable gobbledygook.
VPN is, however, a corporate tool, run by corporate nerds. Your company’s
tech staff can tell you whether or not there’s a VPN server set up for you to
use.
If they do have one, then you’ll need to know the type of server it is. The iPhone
can connect to VPN servers that speak PPTP (Point to Point Tunneling Protocol)
and L2TP/IPsec (Layer 2 Tunneling Protocol over the IP Security Protocol), both
relatives of the PPP language spoken by modems. Most corporate VPN servers
work with at least one of these protocols. (iPhone 1.0 can’t connect to Cisco
servers, although a software update may one day take care of that.)
Chapter 8