Can't connect to some sites over VPN
Talked to a coworker who had the same problem. The issue was that the mtu was set too high on the ppp0 interface.

$ ifconfig ppp0
ppp0: flags=8051&lt;UP,POINTOPOINT,RUNNING,MULTICAST&gt; mtu 1396
        inet 192.168.0.207 --&gt; 192.168.0.200 netmask 0xffffff00


I changed it from 1396 to 1250 and it now works fine. To make the change permanent, I did the following:

$ sudo &lt;your_text_editor_of_choice&gt; /etc/ppp/ip-up

#!/bin/sh
/sbin/ifconfig ppp0 mtu 1250

$ sudo chmod 755 /etc/ppp/ip-up