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net: Dial connects successfully to unreachable host #10186

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brennerm opened this issue Mar 17, 2015 · 6 comments
Closed

net: Dial connects successfully to unreachable host #10186

brennerm opened this issue Mar 17, 2015 · 6 comments
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@brennerm
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What does 'go version' print?

go version go1.4.2 darwin/amd64

What steps reproduce the problem?
http://play.golang.org/p/3Xm-GLcohL

What happened?
returned error is nil when dial any non-existent address.

What should have happened instead?
the error should not be nil.

Please provide any additional information below.
@ianlancetaylor
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I can not recreate the problem on GNU/Linux with either tip or Go 1.4.

Can anybody else recreate it on OS X?

@mrekucci
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Also, I can not reproduce the problem on my Mac OS X 10.10.2.

@brennerm
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Any further information needed from my side?

@mikioh mikioh changed the title net.Dial connects successfully to unreachable host net: Dial connects successfully to unreachable host Mar 17, 2015
@mikioh
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mikioh commented Mar 17, 2015

exact same issue which is already closed

Not true.

conn, err := net.Dial("ip4:1", UNREACHABLE_HOST)

Please revisit what you are trying to do for which protocol and its transport characteristic.

@mikioh mikioh closed this as completed Mar 17, 2015
@mikioh
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mikioh commented Mar 17, 2015

PS: If you need a bit handy ICMP stuff, see http://godoc.org/golang.org/x/net/icmp.
PPS: ICMP is pretty raw stuff, specifying destination address on transmission/source address on reception by connect syscall via Dial API is insufficient to control message exchange.
PPPS: #8276 is epoll, mostly Linux-specific issue. It never happens on platforms using another mech. such as kqueue, IOCP and event port.

@brennerm
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Ok thanks for your support, guys.

@golang golang locked and limited conversation to collaborators Jun 25, 2016
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@mikioh @ianlancetaylor @mrekucci @brennerm @gopherbot