First, rule out the modem.
1)What are the DNS settings on the modem?
It should be using the DNS IPs received from the PPPoE, which should be two of the IP addresses listed
here.
If this is not the case, what are your DNS settings on the modem?
2)If the settings are correct, put the DNS IPs the modem is using (it should be two of the IP addresses listed ) in your PC's settings, and see if that helps.
3)If that doesn't help, please supply the IP addresses you got from PPPoE.
I see no problems from my ADSL line at home:
Code:
$ for dns in wbs-ip-dns.saix.net rrba-ip-dns.saix.net rndf-ip-dns.saix.net tpr-ip-dns.saix.net wblv-ip-dns.saix.net tbnb-ip-dns.saix.net ndn-ip-dns-4.saix.net nngy-ip-dns-4.saix.net;do echo DNS: $dns;dig +noall +answer +stats @$dns www.google.com;done
DNS: wbs-ip-dns.saix.net
www.google.com. 265 IN A 74.125.233.49
www.google.com. 265 IN A 74.125.233.52
www.google.com. 265 IN A 74.125.233.48
www.google.com. 265 IN A 74.125.233.51
www.google.com. 265 IN A 74.125.233.50
;; Query time: 39 msec
;; SERVER: 196.43.34.190#53(196.43.34.190)
;; WHEN: Thu Jul 11 10:30:52 2013
;; MSG SIZE rcvd: 259
DNS: rrba-ip-dns.saix.net
www.google.com. 51 IN A 173.194.41.179
www.google.com. 51 IN A 173.194.41.180
www.google.com. 51 IN A 173.194.41.176
www.google.com. 51 IN A 173.194.41.177
www.google.com. 51 IN A 173.194.41.178
;; Query time: 19 msec
;; SERVER: 196.43.38.190#53(196.43.38.190)
;; WHEN: Thu Jul 11 10:30:52 2013
;; MSG SIZE rcvd: 123
DNS: rndf-ip-dns.saix.net
www.google.com. 294 IN A 74.125.233.80
www.google.com. 294 IN A 74.125.233.82
www.google.com. 294 IN A 74.125.233.81
www.google.com. 294 IN A 74.125.233.83
www.google.com. 294 IN A 74.125.233.84
;; Query time: 19 msec
;; SERVER: 196.43.42.190#53(196.43.42.190)
;; WHEN: Thu Jul 11 10:30:53 2013
;; MSG SIZE rcvd: 259
DNS: tpr-ip-dns.saix.net
www.google.com. 259 IN A 74.125.233.52
www.google.com. 259 IN A 74.125.233.51
www.google.com. 259 IN A 74.125.233.50
www.google.com. 259 IN A 74.125.233.49
www.google.com. 259 IN A 74.125.233.48
;; Query time: 20 msec
;; SERVER: 196.43.45.190#53(196.43.45.190)
;; WHEN: Thu Jul 11 10:30:53 2013
;; MSG SIZE rcvd: 259
DNS: wblv-ip-dns.saix.net
www.google.com. 299 IN A 74.125.233.51
www.google.com. 299 IN A 74.125.233.52
www.google.com. 299 IN A 74.125.233.49
www.google.com. 299 IN A 74.125.233.50
www.google.com. 299 IN A 74.125.233.48
;; Query time: 41 msec
;; SERVER: 196.43.46.190#53(196.43.46.190)
;; WHEN: Thu Jul 11 10:30:53 2013
;; MSG SIZE rcvd: 123
DNS: tbnb-ip-dns.saix.net
www.google.com. 299 IN A 74.125.233.48
www.google.com. 299 IN A 74.125.233.50
www.google.com. 299 IN A 74.125.233.49
www.google.com. 299 IN A 74.125.233.52
www.google.com. 299 IN A 74.125.233.51
;; Query time: 20 msec
;; SERVER: 196.43.50.190#53(196.43.50.190)
;; WHEN: Thu Jul 11 10:30:53 2013
;; MSG SIZE rcvd: 123
DNS: ndn-ip-dns-4.saix.net
www.google.com. 180 IN A 74.125.233.50
www.google.com. 180 IN A 74.125.233.51
www.google.com. 180 IN A 74.125.233.52
www.google.com. 180 IN A 74.125.233.49
www.google.com. 180 IN A 74.125.233.48
;; Query time: 30 msec
;; SERVER: 196.43.53.190#53(196.43.53.190)
;; WHEN: Thu Jul 11 10:30:53 2013
;; MSG SIZE rcvd: 123
DNS: nngy-ip-dns-4.saix.net
www.google.com. 66 IN A 74.125.233.52
www.google.com. 66 IN A 74.125.233.49
www.google.com. 66 IN A 74.125.233.50
www.google.com. 66 IN A 74.125.233.48
www.google.com. 66 IN A 74.125.233.51
;; Query time: 29 msec
;; SERVER: 196.43.54.190#53(196.43.54.190)
;; WHEN: Thu Jul 11 10:30:53 2013
;; MSG SIZE rcvd: 123
$