dslreports logo
 
    All Forums Hot Topics Gallery
spc
Search similar:


uniqs
1971

AWS
Long Time Gone
join:2000-07-01
New Port Richey, FL

AWS

Member

[Business] Getting Business Class Installed Tomorrow

As the title says I'm changing from residential 22/2 to business class 22/5.

Other than the modem change what else can I expect when the installer arrives?

Should I disconnect my router and hook up just my laptop or should I not hook up anything?

According to the welcome packet it seems as if he will be here for a while.

I plan to have everything ready when the installer gets here.

After I'm up and running is it best to shutoff all the features in the modem and assign one of the statics to my router and the rest to the other boxes on my network?

After reading many of the threads it seems the business gateway is best if you just let it pass through traffic to another router.

Anything else I should know?

Thanks

JohnInSJ
Premium Member
join:2003-09-22
Aptos, CA

JohnInSJ

Premium Member

They will use their own laptop to verify it works.

You'd want to have a real router behind it - you could put machines onto statics directly, but you're better off having the router inbetween (your router, not the SMC) for the usual firewall protection - if you directly assign machines statics, they're directly on the internet - so you're relying on their firewalls.
w00tini
join:2009-04-22

w00tini to AWS

Member

to AWS
What John said, pretty much. I had mine installed on Saturday and the guy ran new cable for pretty much the entire drop, apparently on the basis that since he was there, he was going to put brand new cable in just to be sure. If he hadn't have done that it probably would have been a fifteen minute job.

There was a lot of awkward standing around waiting for the SMC to register and lock its channels before he could check it and go.

beachintech
There's sand in my tool bag
Premium Member
join:2008-01-06

beachintech

Premium Member

If it's a D3 device, they take forever and have to do multiple reboots before they are ready to go after an extended power loss (riding around in the techs truck).

My advice for the OP:

Let the tech work. Make sure you have provided the necessary things for the install - location to install the modem, enough power plugs, etc. Most business techs bring their own personal laptops (Not usually company provided) to test things. They will not hook up any of your equipment, or verify that your equipment and setup work. We aren't given time for that. Once they verify your service works and your static IP config is loaded on the modem, you sign the work order, and the tech is finished.

JohnInSJ
Premium Member
join:2003-09-22
Aptos, CA

JohnInSJ

Premium Member

said by beachintech:

Let the tech work.

Yep. They do enjoy a cold soda, if it's hot

MOWAA
join:2010-03-25
Fort Lauderdale, FL

MOWAA

Member

said by JohnInSJ:

said by beachintech:

Let the tech work.

Yep. They do enjoy a cold soda, if it's hot

When there at the office , we always offer them a beer from the CFO's fridge.. it always seems to be the same guy from comcast comes back to our office.

AWS
Long Time Gone
join:2000-07-01
New Port Richey, FL

AWS

Member

Everything went well. The installer checked the signals on existing line and did his thing inside. He didn't leave any IP info, I got 5 statics, so I had to call support to get that and the account number.

Once I had that I shutoff all the NAT, firewall and a bunch of other stuff in the modem, setup my router with one static and the servers with the rest. Had a bit of a problem because support told me the wrong gateway IP. According to every post here on the forum and what support told me it was supposed to be the last IP in the /29 block. As it turns out the first IP in the block is the gateway.

Everything is running well. Speed is faster than my residential service was even though it's basically the same speed except for more upload. The installer said my old modem was the problem. Seems if I had swapped it for a d3 modem the speeds would have been better.

Anyway I'm happy with it. Support was great and you can tell there is a difference between Biz support and res support.

Thanks all for the info.
AWS

AWS

Member

I do have one more question that just came to me.

I logged into comcast.com with my username and password. I went to the account area and noticed the bandwidth meter is gone. I know I have to create an account at the biz portal.

What I want to know is when I do create the account will all my account info be there or do I still have to log in to comcast.com for billing and all?

Is the bandwidth meter now gone?

SpaethCo
Digital Plumber
MVM
join:2001-04-21
Minneapolis, MN

SpaethCo

MVM

said by AWS:

What I want to know is when I do create the account will all my account info be there or do I still have to log in to comcast.com for billing and all?

The main comcast.com portal will continue to have your billing and payment information, the business portal just has the business-specific features.
said by AWS:

Is the bandwidth meter now gone?

Yep, no meter for business accounts.

JohnInSJ
Premium Member
join:2003-09-22
Aptos, CA

JohnInSJ to AWS

Premium Member

to AWS
said by AWS:

Everything went well. The installer checked the signals on existing line and did his thing inside. He didn't leave any IP info, I got 5 statics, so I had to call support to get that and the account number.

He should have left a sheet of paper with that info.

beachintech
There's sand in my tool bag
Premium Member
join:2008-01-06

beachintech

Premium Member

said by JohnInSJ:

said by AWS:

Everything went well. The installer checked the signals on existing line and did his thing inside. He didn't leave any IP info, I got 5 statics, so I had to call support to get that and the account number.

He should have left a sheet of paper with that info.

Should have, but surprisingly, sometimes we don't get that information for the install.

As for the OP:

Your IP,s should be in the Network, Routables, Gateway, Broadcast

So your network would be x.x.x.1
Routables (5) would be x.x.x.2, .3, .4, .5, .6
Gateway would be x.x.x.7
Broadcast would be x.x.x.8

AWS
Long Time Gone
join:2000-07-01
New Port Richey, FL

AWS

Member

Mine is just the opposite. My gateway is x.x.x.2 and usables x.x.x.3 to x.x.x.7

SpaethCo
Digital Plumber
MVM
join:2001-04-21
Minneapolis, MN

1 recommendation

SpaethCo to AWS

MVM

to AWS
Neither of those ranges sound right. For /29s the usable ranges are:

x.x.x.y

Where y is:

1-6
9-14
17-22
...
.249 - .254

The gateway and usable hosts would need to fall within those ranges.

.8 falls on a network boundary (all 0's for host portion of /29)
.7 falls on a broadcast boundary (all 1's for host portion of /29)
hardly
Premium Member
join:2004-02-10
USA

hardly

Premium Member

said by SpaethCo:

Neither of those ranges sound right.
. . .

+1
Jasonfn22
join:2009-11-20
Bethlehem, GA

Jasonfn22 to AWS

Member

to AWS
I would follow the installers direction because anything you mentioned takes 1 to 2 minutes to do so I would wait on the installer let him in the house ask him if he wants a cup of coffee or biscuit,the reason why is the last one at my house ate 2 biscuits and played with my pit bull for 45 minutes but as long as he did not get fired I don't care.My damn dog whined when he left but anyway just let them do their work and somebody on here suggesting something for you to say to them does not set well with some people because that's why they sent this person is because he knows how to do his job and they take it personnel trust me I know I have been on that side of things and their is nothing worse than a customer needing somebody to do their install and when you get their they try and tell you how.I would let him in and watch TV until he returns saying your all set because that's how its done.

JohnInSJ
Premium Member
join:2003-09-22
Aptos, CA

JohnInSJ to SpaethCo

Premium Member

to SpaethCo
said by SpaethCo:

Neither of those ranges sound right. For /29s the usable ranges are:

x.x.x.y

Where y is:

1-6
9-14
17-22
...
.249 - .254

The gateway and usable hosts would need to fall within those ranges.

.8 falls on a network boundary (all 0's for host portion of /29)
.7 falls on a broadcast boundary (all 1's for host portion of /29)

.13-.17 here, GW (the SMC) is .18

Don't forget they also carve out /30s

AWS
Long Time Gone
join:2000-07-01
New Port Richey, FL

AWS

Member

My 5 usable IP's are
x.x.x.14 to x.x.x.18

My gateway is x.x.x.13. This is also the IP of the SMC listed in the network config tab.

It is the only way I get anything working. I was told by support the gateway was x.x.x.18 and nothing worked. I even used a subnet calculator and it even said my gateway should be x.x.x.18.

Just to make sure I am not imagining this I changed the gateway to .18 and internet is dead. Once I switched back to .13 internet and network came back to life.

Could it be the config support sent me while I was talking to her phone is wrong? Or is Comcast changing the way they route the static blocks?

SpaethCo
Digital Plumber
MVM
join:2001-04-21
Minneapolis, MN

2 edits

1 recommendation

SpaethCo to JohnInSJ

MVM

to JohnInSJ
said by JohnInSJ:

.13-.17 here, GW (the SMC) is .18

Don't forget they also carve out /30s

I'm sorry, but that's simply impossible. This is basic binary math.

Binary is read right to left:

16318421
2426
8

So using 8 binary bits, you get 128+64+32+16+8+4+2+1 = 255

The subnet mask defines how many of those bits are network and how many are host. More simply: what IPs are local that you can ARP for, and which IPs need to go to the default gateway.

Say your IP address is 192.168.0.2 with a /29 (255.255.255.248) mask. In binary the IP is represented as:

11000000 10101000 00000000 00000010

The /29 defines how many of those bits need to match to be on the local subnet, so the mask works out like this:

11111111 11111111 11111111 11111000

255 . 255 . 255 . 248

Everything with a "1" needs to match in the IP for it to be local, and everything with a "0" in the subnet mask defines the "wildcard" bit that can be any combination of values used to derive the host addresses.

So all the possible values for 192.168.0.0/29 (modifying only the last 3 bits of the address) are:

11000000 10101000 00000000 00000000 - 192.168.0.0 (Network)
11000000 10101000 00000000 00000001 - 192.168.0.1
11000000 10101000 00000000 00000010 - 192.168.0.2
11000000 10101000 00000000 00000011 - 192.168.0.3
11000000 10101000 00000000 00000100 - 192.168.0.4
11000000 10101000 00000000 00000101 - 192.168.0.5
11000000 10101000 00000000 00000110 - 192.168.0.6
11000000 10101000 00000000 00000111 - 192.168.0.7 (Broadcast)

The network address is defined by the IP where all of the host bits are 0, and broadcast is the address where all the host bits are 1.

Because everything has to break on even powers of 2, the smallest netblock where both .13 and .18 would both be valid IPs would be a /27 with 30 usable IPs.

For masks greater than /24, the last octet will always have a network address starting with:

/25 - 0 128
/26 - 0 64 128 192
/27 - 0 32 64 96 128 160 192 224
/28 - 0 16 32 64 80 96 112 128 144 160 176 192 208 224 240
/29 - 0 8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160 168 176 184 192 200 208 216 224 232 240 248
/30 - same thing but with (4n), where n is 0 to 63.
SpaethCo

SpaethCo to AWS

MVM

to AWS
said by AWS:

My 5 usable IP's are
x.x.x.14 to x.x.x.18

My gateway is x.x.x.13. This is also the IP of the SMC listed in the network config tab.

Log into the SMC at either x.x.x.13 or by going to »10.1.10.1

username: cusadmin
password: highspeed

Under gateway summary -> Network there should be a "Static Netblock" field defined.

Normally Comcast picks their gateway to be the last usable IP in the range, but I'm guessing in your case that is defined as x.x.x.13/30 ? So .14 would be the only usable IP for you.

AWS
Long Time Gone
join:2000-07-01
New Port Richey, FL

AWS

Member

It is a /29
x.x.x.113/29 to be specific.

WAN Internet IP Address x.x.x.113
DNS (primary) 75.75.75.75
DNS (secondary) 75.75.76.76
Date Apr-3-2011
Static IP Block x.x.x.113/29

All I know is Comcast support told me the gateway was x.x.x.118 and that is what I tried and had no network. I had this same thing happen years ago with Digzip DSL and 5 statics from them so I did what I did then and swapped high for low and the network came to light. I also had a clue it was .113 because it was the WAN IP of the SMC.

From everything I've read here and elsewhere it shouldn't work that way, but, it does.
AWS

AWS

Member

Another thing I noticed was the day before the install my residential line went dead. I had to reset the modem and when it came back up I had the .113 IP as my new IP. My IP had never changed in the 5 years we had Comcast.

SpaethCo
Digital Plumber
MVM
join:2001-04-21
Minneapolis, MN

SpaethCo to AWS

MVM

to AWS
Aha. 113, not 13. That leading 1 makes a huge difference in how the math works out.

It makes sense that support would have told you that the gateway was 118 because Comcast's standard is to assign the gateway device the last usable IP from the netblock range, but at 113 it's actually the first usable IP for the range. It doesn't really matter, the gateway just need to be one of the valid host IPs in that range -- it just helps if they are consistently placed within the netblocks for consistent support (as you are finding out).

So that means your valid usable statics are .114 - .118, with a subnet mask of 255.255.255.248, and a default gateway of x.x.x.113

JohnInSJ
Premium Member
join:2003-09-22
Aptos, CA

JohnInSJ to SpaethCo

Premium Member

to SpaethCo
said by SpaethCo:

said by JohnInSJ:

.13-.17 here, GW (the SMC) is .18

I'm sorry, but that's simply impossible. This is basic binary math.

not that it makes much difference, but checking again I do see
x.x.x.113-x.x.x.117 are my usable static IPs (because, yes, I am using all of them) and
x.x.x.118 is the SMC

From the SMC's admin pages Gateway/Summary/Network:
WAN Internet IP Address: x.x.x.118
Static IP Block x.x.x.118/29

for whatever reason, that's the way comcast assigned my IP block.

I know this doesn't follow standard networking layouts, I'm just going by what I see in front of me,

SpaethCo
Digital Plumber
MVM
join:2001-04-21
Minneapolis, MN

SpaethCo

MVM

said by JohnInSJ:

said by SpaethCo:

said by JohnInSJ:

.13-.17 here, GW (the SMC) is .18

I'm sorry, but that's simply impossible. This is basic binary math.

not that it makes much difference, but checking again I do see
x.x.x.113-x.x.x.117 are my usable static IPs (because, yes, I am using all of them) and
x.x.x.118 is the SMC

Same deal - the leading 1 makes all the difference in the world here.

112 is a multiple of 8, 12 is not.

so 112=network, 113-118=usable IPs, 119=broadcast for x.x.x.112/29

pflog
Bueller? Bueller?
MVM
join:2001-09-01
El Dorado Hills, CA

pflog

MVM

Yeah, exactly. The leading 1 here is crucial.

.13 would be in the x.y.z.8/29 block.

If I'm ever in doubt (since I don't do this for a living and don't necessarily think in CIDR ;)), I just whip out ipcalc:

% ipcalc 1.2.3.13/29
Address:   1.2.3.13             00000001.00000010.00000011.00001 101
Netmask:   255.255.255.248 = 29 11111111.11111111.11111111.11111 000
Wildcard:  0.0.0.7              00000000.00000000.00000000.00000 111
=>
Network:   1.2.3.8/29           00000001.00000010.00000011.00001 000
HostMin:   1.2.3.9              00000001.00000010.00000011.00001 001
HostMax:   1.2.3.14             00000001.00000010.00000011.00001 110
Broadcast: 1.2.3.15             00000001.00000010.00000011.00001 111
Hosts/Net: 6                     Class A
 

JohnInSJ
Premium Member
join:2003-09-22
Aptos, CA

JohnInSJ to SpaethCo

Premium Member

to SpaethCo
said by SpaethCo:

Same deal - the leading 1 makes all the difference in the world here.

112 is a multiple of 8, 12 is not.

so 112=network, 113-118=usable IPs, 119=broadcast for x.x.x.112/29

that's reassuring.

NetFixer
From My Cold Dead Hands
Premium Member
join:2004-06-24
The Boro
Netgear CM500
Pace 5268AC
TRENDnet TEW-829DRU

NetFixer to JohnInSJ

Premium Member

to JohnInSJ
said by JohnInSJ:

not that it makes much difference, but checking again I do see
x.x.x.113-x.x.x.117 are my usable static IPs (because, yes, I am using all of them) and
x.x.x.118 is the SMC

From the SMC's admin pages Gateway/Summary/Network:
WAN Internet IP Address: x.x.x.118
Static IP Block x.x.x.118/29

for whatever reason, that's the way comcast assigned my IP block.

I know this doesn't follow standard networking layouts, I'm just going by what I see in front of me,

Yes, Comcast does indeed use a non-standard CIDR format to report the IP range to their customers. Mine is listed by Comcast on my install work order (and in the network summary shown in the SMCD3G) as 75.146.8.46/29 (with the .46 being the SMC IP address). The traditional (correct) CIDR is 75.146.8.40/29.

Before anyone wastes time suggesting that I edit my post, I am not in the least concerned about posting my IP addresses since they are already publicly available to anyone who is interested.