Re: telnet into a netgear switch?

[Pedro Cavaca <pmsac.nanog () gmail com>]

On 25 November 2013 23:42, David Birdsong <david () imgix com> wrote:

> On Nov 25, 2013 1:51 PM, "Jason Pope" <boards188 () gmail com> wrote:
> > ------------------------------
> > Message: 2
> > Date: Sun, 24 Nov 2013 18:47:09 -0800
> > From: David Birdsong <david () imgix com>
> > To: nanog () nanog org
> > Subject: telnet into a netgear switch?
> > Message-ID:
> >         <CAOMvUQfeM_Wnc=
> eS1vz0Gh_pp-vZ+sPRk9Td-1U0A34c3A6jdQ () mail gmail com>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > Hey all, last night while at the datacenter I was in a pinch to extend a
> > rack's LAN. I compromised and ran out to the local Fry's to buy whatever
> > switch I could find so as to allow some configuration to happen while
> > we wait for the real network gear to show up.
> >
> > I left before confirming I could access the switch remotely; it was very
> > late and I was pretty groggy and hey, any network gear has to be
> > telnet'table this day and age. Of course I was mostly wrong.
> >
> > The switch expects some signed payload before allowing a telnet through.
> I
> > found this: https://code.google.com/p/netgear-telnetenable/...but I'm
> > having a hell of a time getting anything to respond.
> >
> > The most confounding part is the switch doesn't respond to a single SYN
> > packet on low ports. I'm scanning all the ports now, but if nothing shows
> > up, I'm not sure what a payload is good for if the switch doesn't ACK a
> > single SYN.
> >
> > I'm curious if anybody's got any tips besides not using Netgear in the
> > datacenter.
> >
> > I have the MAC, I've IP'd it via DHCP, and the model number: JGS524E and
> I
> > can power cycle the switch as much as needed.
> >
> >
> > P.S. long time listener, first time caller. i'm more of a sysadmin
> > dangerously standing in for a proper network person.
> > ------------------------------
> >
> > Seems to me that you need to use their "Switch Configuration Utility" to
> > manage the switch.  I didn't read all the documentation, but that is what
> > jumps out at me after a brief look.  Maybe it will allow you to enable
> > telnet or ssh from there.  See the following link:
>
> No windows box handy, nor the desire for that hoop.
>
> ...but what magic is a windows app going to perform to wake up an
> unresponsive TCP stack?

In view that the application needs to be run directly on the LAN, I'm not
sure why you'd expect any TCP/IP like protocol - I asked a friend for a
packet capture and it seems that the configuration utility is using RRCP (
http://en.wikipedia.org/wiki/Realtek_Remote_Control_Protocol).

HTH


> > http://downloadcenter.netgear.com/en/product/JGS524E
> >
> > Jason