HardwareBanter - View Single Post - Mysterious internet/ethernet issue (kinda need testing/connection/communicationservice to diagnose it ???)

**Char Jackson** · October 16th 18, 04:01 AM posted to alt.comp.hardware.pc-homebuilt

On Sun, 14 Oct 2018 04:48:58 -0700 (PDT), wrote:

No, no hairpinning allowed. If you try to scan a 192.168.x.x or 10.x.x.x
network without actually being on the proper network yourself, your scan
requests will go out to your default gateway where it will simply be
dropped.

When "net route add" is used is it forever or is the setting lost on next boot ?

I don't know because I use "route add -p arguments"

If you use the -p switch when you add a route, it becomes "persistent"
and survives reboots. Otherwise, reboot and it's gone.

***
C:\Windows\System32route /?

Manipulates network routing tables.
-p When used with the ADD command, makes a route persistent
across boots of the system. By default, routes are not
preserved when the system is restarted. Ignored for all
other commands, which always affect the appropriate
persistent routes. This option is not supported in Windows
95.
***

What I think might be happening concerning this scanning of 10.x.x.x

10.x.x.x is one big subnet.

The modem's ip is within 10.x.x.x range.

I mentioned this before, but the modem has two administrative IPs, one
for the WAN side (traffic arriving over the coax) and one for the LAN
side (traffic arriving over the Ethernet interface). The WAN side might
indeed have a 10.x.x.x address, or some other address in some other
subnet, but unless your ISP is a total joke you won't have access to the
WAN side of the modem so it doesn't matter what addressing scheme they
use. You *should* have access to the LAN side of the modem, though.

So it seems to make perfect sense to be able to query other modems and itself even on this subnet.

Only if your ISP allows it, which they'd have to be completely
incompetent to do.

Though maybe setting my PC to IP 10.x.x.x could be a nice track to communicate with this modem ?

Though perhaps 10.x.x.x is only allowed/recognized if it comes over coax... not sure about that.

Well, I did mention it the other day, and again above...