thank you @Junspert
it solves my issues with a BT HUB 3 provide ADSL2, I set mss to 1452 and I can reach all the website.
only one thing I can't work it out if I ping google.com from the Juniper it doesn't to be working :
8.8.8.8 woks :
junipersrx240> ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8): 56 data bytes 64 bytes from 8.8.8.8: icmp_seq=0 ttl=55 time=22.518 ms 64 bytes from 8.8.8.8: icmp_seq=1 ttl=55 time=8.788 ms 64 bytes from 8.8.8.8: icmp_seq=2 ttl=55 time=8.623 ms 64 bytes from 8.8.8.8: icmp_seq=3 ttl=55 time=8.494 ms 64 bytes from 8.8.8.8: icmp_seq=4 ttl=55 time=8.398 ms 64 bytes from 8.8.8.8: icmp_seq=5 ttl=55 time=8.490 ms 64 bytes from 8.8.8.8:^C --- 8.8.8.8 ping statistics --- 7 packets transmitted, 7 packets received, 0% packet loss round-trip min/avg/max/stddev = 8.398/10.539/22.518/4.892 ms
google.com :
ping google.com PING6(56=40+8+8 bytes) :: --> 2a00:1450:400e:805::200e ping: sendmsg: No route to host ping6: wrote google.com 16 chars, ret=-1 ping: sendmsg: No route to host ping6: wrote google.com 16 chars, ret=-1 ping: sendmsg: No route to host ping6: wrote google.com 16 chars, ret=-1 ping: sendmsg: No route to host ping6: wrote google.com 16 chars, ret=-1 ping: sendmsg: No route to host ping6: wrote google.com 16 chars, ret=-1 ^C --- google.com ping6 statistics --- 5 packets transmitted, 0 packets received, 100% packet loss
any suggestion ?