bind socket error

[Modster, Anthony]

Hello
How does unbound determine the IP address and UDP port to use ?

Thanks



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From: Tom Samplonius <tom at samplonius.org>
Sent: Wednesday, June 16, 2021 8:51 PM
To: Modster, Anthony <Anthony.Modster at Teledyne.com>
Cc: unbound-users at lists.nlnetlabs.nl
Subject: Re: bind socket error

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  There are a few possible causes:

1. The IP address isn't assigned, or the interface that it is assigned to, is down.  There is a message in your log account about wireless just connecting?

2. The UDP port is already in use by something else on the system.  My understanding is that Unbound manages its own port range.  No other process on your system should be active in that range.

3. You have an SELinux profile that doesn't allow Unbound to use same UDP port range that Unbound is configured to use.  At one point, the CentOS Unbound rpm had a SELinux profile inconsistent with the Unbound.  Or you changed the Unbound config, and didn't update SELInux.



Tom


On Jun 16, 2021, at 10:56 AM, Modster, Anthony via Unbound-users <unbound-users at lists.nlnetlabs.nl<mailto:unbound-users at lists.nlnetlabs.nl>> wrote:


Hello

What causes the error to bind socket ?

We have seen these errors when configured for "unbound resolver" or "unbound forwarding" modes.

They seem to not cause a problem, the resolver eventually resolves the request.

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [err] [12764:0] error: can\'t bind socket: Cannot assign requested address for 192.168.0.131 port 59253 (len 16)

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [info] [12764:0] info: error sending query to auth server ip4 8.8.8.8 port 53 (len 16)

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [info] [12764:0] info: processQueryTargets: www.carillon.ca<http://www.carillon.ca/>. A IN

*         2021 Jun 16 17:17:35+00:00 wglng-17 wireless [notice] LinkManagerHandler() base station connection BSC1 r0=up r1=dn r2=dn r3=dn eth=dn  BSC2 r0=dn r1=dn r2=dn r3=dn eth=dn

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [info] [12764:0] info: DelegationPoint<.>: 0 names (0 missing), 1 addrs (1 result, 0 avail) parentNS

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [info] [12764:0] info: sending query: www.carillon.ca<http://www.carillon.ca/>. A IN

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [err] [12764:0] error: can\'t bind socket: Cannot assign requested address for 10.130.230.8 port 19652 (len 16)

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [info] [12764:0] info: error sending query to auth server ip4 8.8.8.8 port 53 (len 16)

*         2021 Jun 16 17:17:34+00:00 wglng-17 unbound [info] [12764:0] info: processQueryTargets: www.carillon.ca<http://www.carillon.ca/>. A IN
Thanks


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