From: Tariq Sharif (tariq_sharif@xxxxxxxxxxxxxx)
Date: Tue Apr 03 2001 - 08:42:34 GMT-3
Shawn
Thanks. So text implication that the PC configuration can be minimised by
not having to supply default gateway is not accurate. One can leave out the
default gateway but must "Set all segments as local"
Can anyone tell us how "Set all segments as local" is done?
Many thanks & regards.
Tariq Sharif
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Bowen, Shawn
Sent: 02 April 2001 23:50
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
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