How to change Host-Uniq tag in a PADI (PPPoE Discovery)?
I'm going to be quick, I want to replace my ISP's router at home with a Cisco 2901. The problem is the Cisco router sends PADI but doesn't receive PADO. I checked the PADI from the ISP's router and compared it to the Cisco one, and the only difference is the "Host-Uniq" tag:
I do not believe the Host-Uniq tag can be modified, and according to the following excerpt from RFC 2516, it does not seem it should be of any meaning to the ISP:
This TAG is used by a Host to uniquely associate an Access
Concentrator response (PADO or PADS) to a particular Host request
(PADI or PADR). The TAG_VALUE is binary data of any value and
length that the Host chooses. It is not interpreted by the Access
Concentrator. The Host MAY include a Host-Uniq TAG in a PADI or
PADR. If the Access Concentrator receives this TAG, it MUST
include the TAG unmodified in the associated PADO or PADS
Would it perhaps be possible to call your ISP and ask about this? I do not really think the ISP should be discriminating PPPoE clients based on Host-Uniq field. As you have changed the MAC address, this is really a curious issue as the ISP should indeed not see a difference between your current router and the Cisco.
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