From: tom cheung (tkc9789@xxxxxxxxxxx)
Date: Mon Apr 02 2001 - 20:45:48 GMT-3
What about IRDP? How would one set up a Windows client without a default
gateway and take advantage of IRDP?
>From: "Pickell, Aaryn" <Aaryn.Pickell@getronics.com>
>Reply-To: "Pickell, Aaryn" <Aaryn.Pickell@getronics.com>
>To: "'Bowen, Shawn'" <sbowen@neteffectcorp.com>, Tariq Sharif
><tariq_sharif@btinternet.com>, "Ccielab@Groupstudy. Com"
><ccielab@groupstudy.com>
>Subject: RE: Proxy ARP
>Date: Mon, 2 Apr 2001 19:23:05 -0400
>
>Proxy arp is also useful when you have your subnet masks misconfigured.
>Say, for example, the router has two /24 segments attached. If there is a
>host configured with a /23 instead, it will try arping for addresses which
>are not actually directly connected. The router will respond with its own
>MAC and then forward the traffic.
>
>They use this in access servers as well. Assume a large modem bank on an
>AS5300, with a bunch of users dialing in. Each of these users is given an
>address from the segment that's attached to the ethernet segment. When
>hosts actually on that ethernet wish to talk to the dial-in users, they
>believe them to be directly connected, so they arp. The AS5300 will
>respond
>with its own MAC and forward the packets correctly.
>
>Aaryn Pickell - CCNP, CCDP, MCSE
>Senior Engineer - Routing Protocols
>Getronics Inc.
>Direct: 713-394-1609
>Email:aaryn.pickell@getronics.com
>
>
> > -----Original Message-----
> > From: Bowen, Shawn [mailto:sbowen@neteffectcorp.com]
> > Sent: Monday, April 02, 2001 5:50 PM
> > To: Tariq Sharif; Ccielab@Groupstudy. Com
> > Subject: RE: Proxy ARP
> >
> >
> > With Microsoft clients there is a way to "Set all segments as
> > local" so to
> > speak, I forget how off the top of my head but this will work
> > as well. Now
> > as to proxy ARP, the workstation, be it Unix or Microsoft looks at the
> > destination IP and compares it's own IP and MASK to see if it
> > is local, if
> > it is then it will be encapsulated in an Ethernet (or whatever other
> > topology you are using) frame and then put on the wire, if
> > the destination
> > network is on a different segment then your machine will not
> > know what to do
> > with it unless there is a default gateway setup (or you set
> > "all subnets
> > local"). This is why you are seeing this; it is perfectly
> > normal in the
> > Unix, Novell, and Windows world.
> >
> > As another example. With a Microsoft dial-up
> > networking setup you
> > set it to obtain it's address automatically, sometime do a
> > "winipcfg" on
> > 95/98 or an ipconfig /all in NT and check out your IP and
> > Default gateway,
> > they will normally be the same, this is because the ISP is
> > doing proxy arp
> > and the machine then knows to send ALL traffic to the
> > interface as local
> > traffic, the router will deal with the rest.
> >
> > Shawn
> >
> > -----Original Message-----
> > From: Tariq Sharif [mailto:tariq_sharif@btinternet.com]
> > Sent: Monday, April 02, 2001 6:31 PM
> > To: Ccielab@Groupstudy. Com
> > Subject: Proxy ARP
> >
> > In Doyle's TCP/IP book (page 69-70) & in other text there is
> > about Proxy
> > ARP. Says that hosts without any default gateway can be issue
> > ARP & LAN
> > router (knowing where the destination is) will issue PROXY
> > ARP reply. So the
> > local host (without default gateway) can reach remote hosts.
> > I can't see
> > this working with NT 4 or Win 95 unless I assign the PCs own
> > address as its
> > default gateway. My question is, do Unix clients behave the same as
> > Microsoft clients? If so, what am I missing?
> >
> >
> > Many thanks & regards.
> >
> > Tariq Sharif
> >
> > [demime 0.98b removed an attachment of type
> > application/ms-tnef which had a
> > name of winmail.dat]
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