23 May
2017
23 May
'17
5:41 p.m.
I don't think this is feasible in some cases.
1. It assumes that a ICMP unreachable is sent back. This is not always
the case since there may be routers on the way that block ICMP.
2. On dynamic hosts, if the IP is reallocated, you may target a valid
active IP, and no ICMP unreachable will be returned.
My $0.02
Marius, YO2LOJ
On 24.05.2017 01:32, Brian Kantor wrote:
(Please trim inclusions from previous messages)
_______________________________________________
I got to thinking about Ronen's question as to how to find non-functional
gateway, and I've come up with a scheme.
...
If an ICMP unreachable packet is received, the
matching gateway is
removed from that cycle, so with luck (if the unreachables get here
quickly enough) we'll only send one or two packets to a gateway that's
not reachable.