1) You should set the mtu on

ciscoreg2 · ‎05-16-2015

Hi ALL,

I don't know what I do or what my ISP do some changes. and now I have to change my computer network adapt's mtu to 1492. and my computer can open website. otherwise I can only open few websites. do you guys know how can I do in my cisco 1941 routers for without changing computer mtu? I have tried change router diale1 mtu to 1492, but it doesn't work.

vivek srivastava · ‎05-16-2015

Try to put MTU on physical Ethernet port (of dialer).

Also verify that defragmentation is enabled 8 ur pc.

ciscoreg2 · ‎05-16-2015

defragmentation is enabled in router? how to?

Karsten Iwen · ‎05-16-2015

1) You should set the mtu on your WAN-interface. Depending on your ISP-connection, that could be one of the Gig-Interfaces or a Dialer-interface:

interface Dialer 1
  mtu 1492

2) Configure the router to reduce the maximum segment size (can be on the LAN-Interface):

int gig 0/1
  ip tcp adjust-mss 1452

ciscoreg2 · ‎05-17-2015

I never set this configure beofore, and It's normal. Does our ISP changed somehing at their side?

mtu settings