Trying to access my Comcast modem via the LAN

chpalmer

@JKnott said in Trying to access my Comcast modem via the LAN:

After a couple of seconds of hard Googling, I found this.

From that page-

"Cannot have a fixed Static IP assignment"

JKnott

@chpalmer said in Trying to access my Comcast modem via the LAN:

Comcast will not put the modem in bridgemode if you have static IP addresses.

Does the line "Cannot have a fixed Static IP assignment" in the docs refer to the modem or your LAN? With my modem, there is no address I can reach from outside my network, but I can access it on the LAN side with an address in the 192.168 range. If you have a block of addresses, they should be able to route to use regardless of whether they use NAT or bridge mode.

chpalmer

The modem doubles as the local router for Comcast's purposes. With the static addresses I use with Wave Broadband the statics are forwarded to you. I have my pure bridge Motorola MB8600 in place before my repurposed XTM5 box here with a VIP for my statics. This is how I prefer it to be.

Comcast uses their modem as a router on site. The IP's are routed to you via this method.

So on the same interface you get NAT'd traffic and the routed IP traffic.

JKnott

@chpalmer said in Trying to access my Comcast modem via the LAN:

The modem doubles as the local router for Comcast's purposes.

Other companies do similar, but have addresses entirely separate from the customer's internet access. In those, putting the modem in bridge mode affects only the internet connection. by "Comcast's purposes", do you mean public "Xfinity" WiFi? If so, that's definitely a different address and has nothing to do with the modem mode. You'd be putting only your Internet access portion of the router into bridge mode, not the entire box. Think of if as 2 services sharing the same box.

alpineaudio

Is there a reason you want to stick with Comcast's modem router combo? Why not just get a Docsis 3.1 modem (https://www.arris.com/surfboard/products/cable-modems/sb8200/ gig ready). That's what I did and then went with my own router, that way I eliminated all their crap or issues.

chpalmer

@alpineaudio said in Trying to access my Comcast modem via the LAN:

Is there a reason you want to stick with Comcast's modem router combo?

Yep he does. You need to read the entire thread to find it but he is using static addresses and Comcast requires the use of their equipment.

I'm really surprised there are not more Comcast savoy people reading this and chiming in. Its pretty well known information.

chpalmer

@JKnott said in Trying to access my Comcast modem via the LAN:

@chpalmer said in Trying to access my Comcast modem via the LAN:

The modem doubles as the local router for Comcast's purposes.

Other companies do similar, by "Comcast's purposes", do you mean public "Xfinity" WiFi?

No not the public WIFI crap. Speaking of crap we usually call them Comcrap due to "crap" like this.

By their purposes I mean in order to provide the static IP's they use a local router. (probably not the best use of "their purposes" but I digress.. The Modem/Router combination truly does the routing on site. If the OP was to show his "quality" logs you would see the ping is very small to the gateway router because that is indeed in the modem in this situation.

johnpoz

Back on subject just create a vip

On your wan create a vip, lets call it 10.1.10.2, then create an outbound nat to that vip... There you go access.

bazzacad

Thanks for all the help everyone. Sorry this became a longer topic then I expected. I'll try the VIP option this evening...

bazzacad

So I want the VIP to be the destination for the outbound NAT?

johnpoz

No the vip would be the interface for the nat, dest would be the IP your trying to get to or just the network.. One sec show you a pic.. I don't need it to access my modem.. But I can set one up real quick to show you. My modem which is bridged can still be access via is 192.168.100.1 address..

So create vip on wan say 192.168.100.2 - one sec brb.

here you go. Notice how I selected the vip as the translation in the outbound. You only need to use hybrid not manual.. So now anything coming from 192.168.9.0/24 network going to a 192.168.100.0/24 network will go out the wan using that IP..

And there you go access

bazzacad

Thanks for the screen shots. They're very helpful.
So I'm thinking this is what I'll try. Does it look correct...?
Also, my NAT mode is already set to Manual. Needed it for some PBX rules.

johnpoz

Yeah that looks right.

bazzacad

I added the VIP & NAP, but no luck. :-(
I can ping the VIP & modem from the LAN.

johnpoz

Well you got something back.. Or you wouldn't have gotten that page.. So you got a syn,ack I would assume.. So your vip is working.

Sniff on the wan when you try and open the page.. do you see the syn,ack come back from your syn.. If so pfsense is doing what you told it to do.

Why did you do a /32? Set that to /24

bazzacad

OK I fixed the /32 thx.
By Sniff do you mean WireShark?
Or can I do it in pfSense?

stephenw10

You can do it within pfSense:
https://docs.netgate.com/pfsense/en/latest/monitoring/performing-a-packet-capture.html

Steve