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What causes port leases to expire?
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NickH



Joined: 10 Feb 2018
Posts: 26

PostPosted: Wed Aug 18, 2021 3:32 pm    Post subject: Reply with quote

So, if the PS4 gets an IP address by DHCP and gets its reservations and then is not used for a while, it may get another IP address next time it is switched on. Then you end up with two uPnP port forwards to different LAN IP's (if using iptables) and this cannot work.

I had the same with a Sia server where I moved the app to a different machine (and therefore IP address). At least if there were a sensible lease time, the lease would expire and allow the other port forward to work.

It sounds like this is not a brilliant aspect of the uPnP spec.
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miniupnp
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Joined: 14 Apr 2007
Posts: 1591

PostPosted: Wed Aug 18, 2021 3:34 pm    Post subject: Reply with quote

NickH wrote:
So, if the PS4 gets an IP address by DHCP and gets its reservations and then is not used for a while, it may get another IP address next time it is switched on. Then you end up with two uPnP port forwards to different LAN IP's (if using iptables) and this cannot work.

I had the same with a Sia server where I moved the app to a different machine (and therefore IP address). At least if there were a sensible lease time, the lease would expire and allow the other port forward to work.

It sounds like this is not a brilliant aspect of the uPnP spec.

That's why IGDv2 does not allow unlimited lease time.

But anyway, it is also a good thing to configure the DHCP server to always allocate the same IP to the PS4
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