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Aug
24
comment Can't source IP == destination IP for public IPs in home network?
@user142485 10.*.*.*/8 is a RFC1918 address range. You can set the mask to anything between 8 and 30 for a LAN, depending on how many hosts you have. (tools.ietf.org/html/rfc1918)
Aug
24
awarded  Commentator
Aug
24
comment Can't source IP == destination IP for public IPs in home network?
@Luke I fixed the problem I had, but I'm posting here with a question that I don't have the answer for.
Aug
24
asked Can't source IP == destination IP for public IPs in home network?
Aug
22
revised Understanding the static IP I just purchased
added 3 characters in body
Aug
22
awarded  Editor
Aug
22
revised Understanding the static IP I just purchased
added 502 characters in body
Aug
22
accepted Understanding the static IP I just purchased
Aug
22
comment Understanding the static IP I just purchased
@SeanC. You're absolutely correct: the cable modem is acting as a DHCP server and router, and it does have a web interface. I'm going to work on seeing if it allows bridging of my internal devices (aka a DMZ) and take my home router out of the picture for now. In any case, your answers/suggestions have been invaluable; many thanks.
Aug
22
comment Understanding the static IP I just purchased
I have access to *nix boxes all over the country... but since I don't know any public IPs in my home network, I can't traceroute to them. (traceroute to 1.2.3.61 and 1.2.3.62 both end at 68.86.105.58 and 71.237.109.255 resp, without reaching my home network)
Aug
22
comment Understanding the static IP I just purchased
The comcast-provided cable modem has a coax in, and 4 "LAN" ports out. I now have my laptop on one of those (bypassing my home router). The cable modem is assigning me a 10/8 address (the router was giving me 192.168/16 addresses). Traceroute shows outbound traffic as hitting 10.1.10.1 (which is the DHCP-assigned gateway addr for my laptop) and then 73.252.30.1 (a comcast router somewhere )
Aug
22
comment Understanding the static IP I just purchased
I viewed business.comcast.com/smb/services/Internet/ipaddress and then called to request a static IP.
Aug
22
comment Understanding the static IP I just purchased
I think your edited scenario must be the correct one since an RFC1918 address assigned to my router would prevent my server inside the DMZ from being reached from the outside. I still don't understand why my externally-reported IP is that of the gateway, however.
Aug
22
comment Understanding the static IP I just purchased
This is a wonderful post with lots of detail, but it's all about NAT. I understand NAT perfectly well, I just don't understand which IPs are assigned where in my home network.
Aug
22
comment Understanding the static IP I just purchased
This is what I thought; something has me confused: whatismyip.com shows 1.2.3.62 (ie, the gateway IP). Doesn't this mean my ISP gateway is rewriting its IP addr in the outgoing packet? Doesn't that mean I can't route to my home network?
Aug
22
comment Understanding the static IP I just purchased
@Darius ipconfig/all shows a gateway of 192.168.2.1 (ie, a non-routable address), which doesn't help me. I want to know what my router's public IP is.
Aug
22
awarded  Student
Aug
22
asked Understanding the static IP I just purchased
Aug
18
awarded  Scholar
Aug
18
accepted Converting my home network to accommodate a server with static IP