Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Can ISP block WIFI router from setting up PPPOE connection?

My ISP filtered clients by MAC. I cloned my MAC to WIFI router and everything was fine. Today my ISP started to block all WIFI routers. My Dlink DIR-300 with DD-WRT can not establish PPPOE connection anymore. PPPOE works fine on all PCs I tried. It seems there is no MAC filtering anymore and ISP uses another method to find WIFI routers.

share|improve this question

Change TTL in Windows OS.

DefaultTTL DWORD dectimal 129 or Hex 81

Restart OS.


Windows Registry Editor Version 5.00


Restart OS.


Windows Registry Editor Version 5.00


Restart OS.

Restore default delete DefaultTTL.

Set TTL 128 in Dlink DIR-300 if possible.

iptables -t mangle -I POSTROUTING -o `get_wanface` -j TTL --ttl-set 128
iptables -t mangle -I PREROUTING -i vlan1 -j TTL --ttl-set 129

DD-WRT wiki Iptables command

Change ISP ...

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.