Experiencing the same thing. I've done a couple of ping tests and traceroutes to different public IPs.
Nation-wide servers from PLDT seem to respond correctly.
Yahoo, whois.net, apnic.com, and a root DNS server looks effed up.
Google's (72.14.203.103) fine though. Hehehe.
On a related note, the PLDT field engineer came by our home and told me there was an advisory of an current problem with I-Gate.