Messages in this thread | | | From | Richard Kettlewell <> | Date | Thu, 30 Sep 1999 10:10:45 +0100 (BST) | Subject | Re: Why no printk for duplicate IPs? |
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Alex Nicolaou writes:
> You are the second person with this opinion! Will someone please > tell me how well IP works if someone else is answering ARP requests > for your IP address?
Actually I have done this (by accident)... we had an ISDN router attached to our network once which was answering ARP requests for (essentially) all IP addresses, due to braindead factory configuration.
The symptom was that all the NT and 95 systems were completely shafted, but the UNIX hosts largely survived and continued talking to each other.
Our theory was that the UNIX systems were answering ARP requests faster than this misconfigured router, but the NT systems were too slow and so the router got its answer in first.
As it happens we didn't re-ifconfig any of the UNIX machines during this. However had we done so (e.g. if a machine had been rebooting around the same time for unrelated reasons) then a feature that made the ifconfig fail if something else answered ARP would have made the situation much worse.
Warnings about bogus ARP traffic, on the other hand, would probably have led us to a solution much more rapidly.
ttfn/rjk
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