Comcast Bussiness Class and GRE Tunnels
Nate Burke
nate at blastcomm.com
Tue Jul 26 15:07:37 UTC 2011
Hello, I'm hoping that someone here might have run into a similar issue
and might be able to offer me some pointers.
I have a customer that I am providing redundant paths to, one link over
a microwave connection, and a backup link over a Comcast Business Class
Connection. Everything on the Microwave link is working fine. On the
Comcast Connection, I have a Static IP from Comcast, and I want to setup
a vendor specific GRE tunnel (Mikrotik EoIP) from my NOC to the Comcast
Static IP Address. It looks like the SPI Firewall inside the SMC
Gateway required by comcast is blocking the GRE packets, I'm basing this
on the fact that when I power cycle the modem, I get 1 ICMP Packet
through the GRE Tunnel while the modem is booting up, then it stops
again. I have gotten to Tier2 support who swears that all Firewalls on
the SMC Gateway are disabled.
As a workaround, I was able to establish a PPTP tunnel to my NOC,
however it seems like the tunnel will only run for a few hours, then
becomes slow to the point of being unusable. In my mind this would be
no different than setting up a permanent VPN back to a corporate office,
which I would think happens all the time, so I'm not sure why I'm
running into issues with it.
Anyone with Insights or comments would be appreciated.
Thanks,
Nate Burke
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