Resolvi,
fixei o MTU com estas regras:
Código HTML:
/ ip firewall mangle
add chain=forward action=jump jump-target=mss comment="\[tcp\], mss" disabled=no
add chain=mss protocol=tcp tcp-flags=syn tcp-mss=!536-1460 action=change-mss new-mss=1440 comment="\[tcp\], mss fixation" \
disabled=no
add chain=mss protocol=tcp tcp-flags=syn tcp-mss=1453-65535 action=change-mss new-mss=1440 comment="\[tcp\], mss 1440 for \
mtu 1492" disabled=no
add chain=mss protocol=tcp tcp-flags=syn action=change-mss new-mss=clamp-to-pmtu comment="\[tcp\], mss clamp-to-pmtu" \
disabled=no
add chain=prerouting action=change-ttl new-ttl=set:65 comment="\[tcp\], mss ttl fix" disabled=no
Por favor comentem!
Uso adsl e pretendo logo em breve fazer loadbalance.