The issue, as I see it, is that the Vigor will
NAT all traffic from 192.168.8.0 , rather than
Routing it. In other words, it will treat everything on that network, as though it is the big, bad, Internet.
Anything outbound from the Vigor's WAN port will appear to come from 192.168.8.98 and replies to that traffic will be matched to entries in the NAT table and routed to the client on 192.168.1.0 that initiated it.
In this scenario, something like a Printer, will probably work - though its status reporting and scanner functions may not (because it will be unsolicited traffic). However, a general wi-fi client of the Huawei will not (because it's all unsolicited traffic). Rather, it would have to address 192.168.8.98 rather than the desired 192.168.1.x address and the Vigor would have to be configured to pass traffic of that type, to a particular device. This configuration would have to take the form of Port Redirection, Open Ports or the DMZ host.
(You could try adding a Route on the wi-fi client [192.168.1.0/24 => 192.168.8.98/32] ... but I don't think the Vigor will honour it. But you never know your luck!)
Alternatives:
You could VPN from a 192.168.8.0 client to the Vigor, thus obtaining a 2nd, 192.168.1.x address and effectively ending up on the 'main' LAN. Not everything works over a VPN though...
or
You could plug the 192.168.8.0 network into a Vigor LAN port and use the VLAN functionality to Route between the two. The Vigor would need a static, default route - to mimic the one that currently set for the WAN port. The Huawei will probably also need a Route establishing to the 192.168.1.0 network, since it will be the Default Gateway for everything on
its LAN.
or
You could use some
RJ45 'doublers'
to have two connections down one UTP cable (limited to max 100Mbs, because 1Gbps requires use of all four pairs).
