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Talking to my cable modem
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Celejar
Jan 23, 2013, 9:20:01 AM1/23/13
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I recently purchased and began using a cable modem - the Zyxel (Hitron)
BRG-35503:
http://www.hitrontech.com/en/cable_detail.php?id=3
It (so far) Just Works (I plugged into my router running OpenWRT, the
router gets an IP address (via DHCP), and we have net connectivity),
but I'd like to hack into the device, to play with it, find any
tunables and settings, and just understand it better.
The public interface of the router gets an IP address from my ISP's
address space, and that's the IP address that outbound connections are
initiated from. Tracerouting out shows the first hop as a private IP
address on my LAN (192.168.0.1), and the next hop is an address in my
ISP's space (specifically, the address the router is getting assigned
but with the last quad replaced with '1').
The thing comes with no manual or disk, just a quickstart guide,
containing nothing beyond very basic quickstart instructions. I have no
idea if this thing even has a web interface - I can't find one on any
of the addresses I've tried. I've tried portscanning with nmap,
pointing it at the address of the first hop, and I get no open ports,
and the only closed one is 179/bgp; I'm guessing this is my ISP's edge
router.
Am I correct in assuming that my modem has no IP address, and is
operating in bridge mode? Any idea how I can access it? The thing's
datasheet claims that it has "extensive SNMP management support", but I
have never used snmp and I have no idea what to do with it.
Celejar
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BRG-35503:
http://www.hitrontech.com/en/cable_detail.php?id=3
It (so far) Just Works (I plugged into my router running OpenWRT, the
router gets an IP address (via DHCP), and we have net connectivity),
but I'd like to hack into the device, to play with it, find any
tunables and settings, and just understand it better.
The public interface of the router gets an IP address from my ISP's
address space, and that's the IP address that outbound connections are
initiated from. Tracerouting out shows the first hop as a private IP
address on my LAN (192.168.0.1), and the next hop is an address in my
ISP's space (specifically, the address the router is getting assigned
but with the last quad replaced with '1').
The thing comes with no manual or disk, just a quickstart guide,
containing nothing beyond very basic quickstart instructions. I have no
idea if this thing even has a web interface - I can't find one on any
of the addresses I've tried. I've tried portscanning with nmap,
pointing it at the address of the first hop, and I get no open ports,
and the only closed one is 179/bgp; I'm guessing this is my ISP's edge
router.
Am I correct in assuming that my modem has no IP address, and is
operating in bridge mode? Any idea how I can access it? The thing's
datasheet claims that it has "extensive SNMP management support", but I
have never used snmp and I have no idea what to do with it.
Celejar
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Karl E. Jorgensen
Jan 23, 2013, 9:50:02 AM1/23/13
to
On Wed, Jan 23, 2013 at 02:11:38PM +0000, Celejar wrote:
> I recently purchased and began using a cable modem - the Zyxel (Hitron)
> BRG-35503:
>
> http://www.hitrontech.com/en/cable_detail.php?id=3
>
> It (so far) Just Works (I plugged into my router running OpenWRT, the
> router gets an IP address (via DHCP), and we have net connectivity),
> but I'd like to hack into the device, to play with it, find any
> tunables and settings, and just understand it better.
>
> The public interface of the router gets an IP address from my ISP's
> address space, and that's the IP address that outbound connections are
> initiated from. Tracerouting out shows the first hop as a private IP
> address on my LAN (192.168.0.1), and the next hop is an address in my
> ISP's space (specifically, the address the router is getting assigned
> but with the last quad replaced with '1').
That IP address (x.x.x.1) is probably your ISP router - .1 is commonly
> I recently purchased and began using a cable modem - the Zyxel (Hitron)
> BRG-35503:
>
> http://www.hitrontech.com/en/cable_detail.php?id=3
>
> It (so far) Just Works (I plugged into my router running OpenWRT, the
> router gets an IP address (via DHCP), and we have net connectivity),
> but I'd like to hack into the device, to play with it, find any
> tunables and settings, and just understand it better.
>
> The public interface of the router gets an IP address from my ISP's
> address space, and that's the IP address that outbound connections are
> initiated from. Tracerouting out shows the first hop as a private IP
> address on my LAN (192.168.0.1), and the next hop is an address in my
> ISP's space (specifically, the address the router is getting assigned
> but with the last quad replaced with '1').
used for routers.
> The thing comes with no manual or disk, just a quickstart guide,
> containing nothing beyond very basic quickstart instructions. I have no
> idea if this thing even has a web interface - I can't find one on any
> of the addresses I've tried. I've tried portscanning with nmap,
> pointing it at the address of the first hop, and I get no open ports,
> and the only closed one is 179/bgp; I'm guessing this is my ISP's edge
> router.
OpenWRT can tell you? If it got its IP address via DHCP, it should
have it's default gateway set to the IP address of the cable modem.
>
> Am I correct in assuming that my modem has no IP address, and is
> operating in bridge mode? Any idea how I can access it? The thing's
> datasheet claims that it has "extensive SNMP management support", but I
> have never used snmp and I have no idea what to do with it.
Perhaps it supports UPNP ? If so, you may be able to use the
upnp-router-control package/app to extract some interesting
information from it..
--
Karl E. Jorgensen
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Celejar
Jan 23, 2013, 6:10:03 PM1/23/13
to
On Wed, 23 Jan 2013 14:46:05 +0000
"Karl E. Jorgensen" <karl.jo...@nice.com> wrote:
> On Wed, Jan 23, 2013 at 02:11:38PM +0000, Celejar wrote:
> > I recently purchased and began using a cable modem - the Zyxel (Hitron)
> > BRG-35503:
> >
> > http://www.hitrontech.com/en/cable_detail.php?id=3
> >
> > It (so far) Just Works (I plugged into my router running OpenWRT, the
> > router gets an IP address (via DHCP), and we have net connectivity),
> > but I'd like to hack into the device, to play with it, find any
> > tunables and settings, and just understand it better.
> >
> > The public interface of the router gets an IP address from my ISP's
> > address space, and that's the IP address that outbound connections are
> > initiated from. Tracerouting out shows the first hop as a private IP
> > address on my LAN (192.168.0.1), and the next hop is an address in my
> > ISP's space (specifically, the address the router is getting assigned
> > but with the last quad replaced with '1').
>
> That IP address (x.x.x.1) is probably your ISP router - .1 is commonly
> used for routers.
I figured as much, as per my original email (below).
"Karl E. Jorgensen" <karl.jo...@nice.com> wrote:
> On Wed, Jan 23, 2013 at 02:11:38PM +0000, Celejar wrote:
> > I recently purchased and began using a cable modem - the Zyxel (Hitron)
> > BRG-35503:
> >
> > http://www.hitrontech.com/en/cable_detail.php?id=3
> >
> > It (so far) Just Works (I plugged into my router running OpenWRT, the
> > router gets an IP address (via DHCP), and we have net connectivity),
> > but I'd like to hack into the device, to play with it, find any
> > tunables and settings, and just understand it better.
> >
> > The public interface of the router gets an IP address from my ISP's
> > address space, and that's the IP address that outbound connections are
> > initiated from. Tracerouting out shows the first hop as a private IP
> > address on my LAN (192.168.0.1), and the next hop is an address in my
> > ISP's space (specifically, the address the router is getting assigned
> > but with the last quad replaced with '1').
>
> That IP address (x.x.x.1) is probably your ISP router - .1 is commonly
> used for routers.
> > The thing comes with no manual or disk, just a quickstart guide,
> > containing nothing beyond very basic quickstart instructions. I have no
> > idea if this thing even has a web interface - I can't find one on any
> > of the addresses I've tried. I've tried portscanning with nmap,
> > pointing it at the address of the first hop, and I get no open ports,
> > and the only closed one is 179/bgp; I'm guessing this is my ISP's edge
> > router.
>
> Hm... surely the thing must have an internal IP address. Perhaps the
> OpenWRT can tell you? If it got its IP address via DHCP, it should
> have it's default gateway set to the IP address of the cable modem.
> > Am I correct in assuming that my modem has no IP address, and is
> > operating in bridge mode? Any idea how I can access it? The thing's
> > datasheet claims that it has "extensive SNMP management support", but I
> > have never used snmp and I have no idea what to do with it.
>
> Try running nmap(1) against it - on the internal IP address of it.
getting an IP address on its external interface from somewhere on the
ISP's network, and I have no idea what IP address, if any, the modem
itself has.
> Perhaps it supports UPNP ? If so, you may be able to use the
> upnp-router-control package/app to extract some interesting
> information from it..
my linux laptop returns no available information .
Thanks,
> Karl E. Jorgensen
Celejar
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Kelly Clowers
Jan 23, 2013, 6:30:02 PM1/23/13
to
Actually, I think that might be semi-standard, at least try it. If it has snmp,
you could look for that with, say, nmap (assuming it is enabled)
http://serverfault.com/questions/415521/how-to-find-all-the-snmp-enabled-devices-in-my-network
Cheers,
Kelly Clowers
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Celejar
Jan 23, 2013, 7:00:02 PM1/23/13
to
earth I was supposed to figure that out is beyond me, but thanks a
million! [I'm used to routers, which in my experience generally use
192.168.1.1 or 192.168.0.1]
It seems to show a lot of information, but I see almost nothing in the
way of settings. I suppose that if it really has no router
functionality, and just acts as a simple bridge, there isn't much to
tune?
> you could look for that with, say, nmap (assuming it is enabled)
>
> http://serverfault.com/questions/415521/how-to-find-all-the-snmp-enabled-devices-in-my-network
> Cheers,
> Kelly Clowers
Celejar
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Kelly Clowers
Jan 23, 2013, 9:00:01 PM1/23/13
to
On Wed, Jan 23, 2013 at 3:51 PM, Celejar <cel...@gmail.com> wrote:
>
> Huh, look at that - it has a web interface at that address. How on
> earth I was supposed to figure that out is beyond me, but thanks a
> million! [I'm used to routers, which in my experience generally use
> 192.168.1.1 or 192.168.0.1]
>
> It seems to show a lot of information, but I see almost nothing in the
> way of settings. I suppose that if it really has no router
> functionality, and just acts as a simple bridge, there isn't much to
> tune?
Yeah, it seems they don't want people to know. Glad it worked, though!
>
> Huh, look at that - it has a web interface at that address. How on
> earth I was supposed to figure that out is beyond me, but thanks a
> million! [I'm used to routers, which in my experience generally use
> 192.168.1.1 or 192.168.0.1]
>
> It seems to show a lot of information, but I see almost nothing in the
> way of settings. I suppose that if it really has no router
> functionality, and just acts as a simple bridge, there isn't much to
> tune?
Pretty sure one reason they use .100.1 is to avoid stepping on the
toes of home routers, since they are often used together.
As far as settings, I think you have to hack it a bit to do that, if it
is possible at all. It is on some Motos, I know...
Cheers,
Kelly Clowers
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Celejar
Jan 23, 2013, 9:50:02 PM1/23/13
to
On Wed, 23 Jan 2013 17:53:56 -0800
Kelly Clowers <kelly....@gmail.com> wrote:
> On Wed, Jan 23, 2013 at 3:51 PM, Celejar <cel...@gmail.com> wrote:
> >
> > Huh, look at that - it has a web interface at that address. How on
> > earth I was supposed to figure that out is beyond me, but thanks a
> > million! [I'm used to routers, which in my experience generally use
> > 192.168.1.1 or 192.168.0.1]
> >
> > It seems to show a lot of information, but I see almost nothing in the
> > way of settings. I suppose that if it really has no router
> > functionality, and just acts as a simple bridge, there isn't much to
> > tune?
>
> Yeah, it seems they don't want people to know. Glad it worked, though!
> Pretty sure one reason they use .100.1 is to avoid stepping on the
> toes of home routers, since they are often used together.
Makes sense.
Kelly Clowers <kelly....@gmail.com> wrote:
> On Wed, Jan 23, 2013 at 3:51 PM, Celejar <cel...@gmail.com> wrote:
> >
> > Huh, look at that - it has a web interface at that address. How on
> > earth I was supposed to figure that out is beyond me, but thanks a
> > million! [I'm used to routers, which in my experience generally use
> > 192.168.1.1 or 192.168.0.1]
> >
> > It seems to show a lot of information, but I see almost nothing in the
> > way of settings. I suppose that if it really has no router
> > functionality, and just acts as a simple bridge, there isn't much to
> > tune?
>
> Yeah, it seems they don't want people to know. Glad it worked, though!
> Pretty sure one reason they use .100.1 is to avoid stepping on the
> toes of home routers, since they are often used together.
> As far as settings, I think you have to hack it a bit to do that, if it
> is possible at all. It is on some Motos, I know...
basic networking settings that are generally standard and well
understood, the cable modem stuff seems to include a lot of highly
specialized and arcane settings that aren't meant for the layman.
> Cheers,
> Kelly Clowers
Thanks,
Celejar
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