On 07/06/16 02:17, Zero Jay wrote: > When the ipxe getting the *IPv6 address*, it always shows *Connection > timeout*as below----(The IPv4 is working) Your "working" packet capture for RHEL6.7 does not show anything which relates to the acquiring of an IPv6 address. Could you try capturing the relevant portion of the traffic for RHEL6.7? Thanks, Michael