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net: inaccurate docs about announcing or listening on all local addresses #17616

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mikioh opened this issue Oct 26, 2016 · 3 comments

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@mikioh
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commented Oct 26, 2016

The current documentation says:

func Listen, ListenPacket, Listen{TCP,UDP,UP}

Listen listens on all available interfaces instead of just the interface with the given
host address. 

I think it provides inaccurate information. What happens when you move an interface address on network interface X to another? Does it break your application? (Please consider that how VRRP or CARP works) Actually it announcing or listening on all local addresses.

@quentinmit

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commented Nov 1, 2016

I don't understand the question. I read the docs as saying "Listen without a host address listens on all possible addresses on all interfaces". I think it's unspecified whether it picks up changes to the host's interfaces after startup - on *nix I expect that it would, but I don't think we guarantee that.

@quentinmit quentinmit added this to the Go1.8 milestone Nov 1, 2016

@rsc rsc modified the milestones: Go1.9, Go1.8 Nov 11, 2016

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commented Nov 17, 2016

@quentinmit,

From architectural point of view, an IP address is basically assigned to a link (or an interface or network interface which is an attachment to the link), agree. But practically, there are implementations that have addresses not assigned to link or interface; for example, 127.0.0.1/8 or IPv6 loopback address. I personally don't want to see an issue like "the Addr method of net.Interface doesn't show 127.0.0.1/8 but net.Listen("tcp", "127.0.0.1:0") works perfectly. Is this a bug?"

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commented Jan 8, 2017

CL https://golang.org/cl/34876 mentions this issue.

@bradfitz bradfitz modified the milestones: Go1.10, Go1.9 Jun 13, 2017

@gopherbot gopherbot closed this in 424b065 Jun 22, 2017

@golang golang locked and limited conversation to collaborators Jun 22, 2018

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