Routing issue

I am trying to access IP address 67.[Edited: "Personal Information"] (a Comcast supplied address) from my new XFi gateway at 98.[Edited: "Personal Information"]. The day before yesterday, it all worked perfectly.  Starting yesterday it stopped working. It does work if I access the 67… address from a different network.  I am doing this over a wireless connection in both cases.  Unfortunately I don’t currently have access to nmap at the 98… location at this time. Traceroute in the reverse direction doesn’t terminate in a reasonable time.  I don’t currently have tools at the 98… location so I am unable to try things out.  

Any suggestions would be helpful.  

Regards,