Static DHCP Issues related to DHCP Lease Expires

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Static DHCP Issues related to DHCP Lease Expires

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Static DHCP Issues related to DHCP Lease Expires
Static DHCP Issues related to DHCP Lease Expires
2023-09-08 21:30:27 - last edited 2023-09-13 06:54:42
Tags: #DHCP Service #Lease Expire
Model: ER605 (TL-R605)  
Hardware Version: V1
Firmware Version: 1.3.0 Build 20230511 Rel.51317

For all of my dynamic DHCP leases the lease expire has 120 minutes.

 

For all of my static DHCP leases the lease expire has Expires : October 9, 2159 1:20:03 AM

 

Using router in standalone mode until all of the standalone features are available in the Omada Management Platform which as of this version of the firmware they are not.

 

I have seen reference to other consumer TP-Link routers having this issue of DHCP expiry times. 49710 days, 6 hours, 28 minutes, 15 seconds but related to that article, there was no solution given.

 

If you require additonal information, I can offer that to you.

 

Experienced network admin here so please ask appropriate questions.

 

Thanks.

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#1
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Re:Static DHCP Issues related to DHCP Lease Expires-Solution
2023-09-11 12:26:31 - last edited 2023-09-13 06:54:42

mlatta wrote

For all of my dynamic DHCP leases the lease expire has 120 minutes.

 

For all of my static DHCP leases the lease expire has Expires : October 9, 2159 1:20:03 AM

 

Using router in standalone mode until all of the standalone features are available in the Omada Management Platform which as of this version of the firmware they are not.

 

I have seen reference to other consumer TP-Link routers having this issue of DHCP expiry times. 49710 days, 6 hours, 28 minutes, 15 seconds but related to that article, there was no solution given.

 

If you require additonal information, I can offer that to you.

 

Experienced network admin here so please ask appropriate questions.

 

Thanks.

  @mlatta 

RFC1541 Section 3.3 answers your question, I believe.

datatracker.ietf(dot)org/doc/html/rfc1541ection-3.3

FFFF FFFF converts to 4294967295 decimal, which is in seconds.

4294967295 seconds converts to 136 years 70 days 6 hrs. 28 min. 15 sec.

This is expected per RFC1541.

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#6
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Re:Static DHCP Issues related to DHCP Lease Expires
2023-09-08 23:02:59

 

mlatta wrote

For all of my dynamic DHCP leases the lease expire has 120 minutes.

 

For all of my static DHCP leases the lease expire has Expires : October 9, 2159 1:20:03 AM

 

Using router in standalone mode until all of the standalone features are available in the Omada Management Platform which as of this version of the firmware they are not.

 

I have seen reference to other consumer TP-Link routers having this issue of DHCP expiry times. 49710 days, 6 hours, 28 minutes, 15 seconds but related to that article, there was no solution given.

 

If you require additonal information, I can offer that to you.

 

Experienced network admin here so please ask appropriate questions.

 

Thanks.

 

  @mlatta 

Interesting, mine has a lease till October 16, 2159.

Maybe that is to be expected when using DHCP reservations?  

Is there any problems with having a lease expire that far in the future if you have reserved the IP address?

 

 

IPCONFIG / ALL

Ethernet adapter vEthernet (External Virtual Switch):

   Connection-specific DNS Suffix  . : lan
   Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter #2
   Physical Address. . . . . . . . . : D8-xxxxxxxxxxxxxxx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : fda9:xxxxxxxxxxxxxxxxxxxxxxxxxxxx(Preferred)
   Temporary IPv6 Address. . . . . . : fda9:xxxxxxxxxxxxxxxxxxxxxxxx(Preferred)
   Link-local IPv6 Address . . . . . : fe80::xxxxxxxxxxxxxx(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.0.140(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Friday, September 8, 2023 2:00:50 AM
   Lease Expires . . . . . . . . . . : Tuesday, October 16, 2159 12:57:16 AM
   Default Gateway . . . . . . . . . : 192.168.0.1
   DHCP Server . . . . . . . . . . . : 192.168.0.1
   DHCPv6 IAID . . . . . . . . . . . : 41xxxxxxx
   DHCPv6 Client DUID. . . . . . . . : 00-xxxxxxxxxxxxxxxxxxxxx
   DNS Servers . . . . . . . . . . . : 192.168.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

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Re:Static DHCP Issues related to DHCP Lease Expires
2023-09-11 02:44:30 - last edited 2023-09-11 02:45:44

  @jg1212 

Interesting, mine has a lease till October 16, 2159.

Maybe that is to be expected when using DHCP reservations?  

Is there any problems with having a lease expire that far in the future if you have reserved the IP address?

 

 

IPCONFIG / ALL

Ethernet adapter vEthernet (External Virtual Switch):

   Connection-specific DNS Suffix  . : lan
   Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter #2
   Physical Address. . . . . . . . . : D8-xxxxxxxxxxxxxxx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : fda9:xxxxxxxxxxxxxxxxxxxxxxxxxxxx(Preferred)
   Temporary IPv6 Address. . . . . . : fda9:xxxxxxxxxxxxxxxxxxxxxxxx(Preferred)
   Link-local IPv6 Address . . . . . : fe80::xxxxxxxxxxxxxx(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.0.140(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Friday, September 8, 2023 2:00:50 AM
   Lease Expires . . . . . . . . . . : Tuesday, October 16, 2159 12:57:16 AM
   Default Gateway . . . . . . . . . : 192.168.0.1
   DHCP Server . . . . . . . . . . . : 192.168.0.1
   DHCPv6 IAID . . . . . . . . . . . : 41xxxxxxx
   DHCPv6 Client DUID. . . . . . . . : 00-xxxxxxxxxxxxxxxxxxxxx
   DNS Servers . . . . . . . . . . . : 192.168.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

 

ain't this virtual machine IP address? LOL.

i think virtual machine would get something like this, unless you modify its NAT mode. 

 

Ethernet adapter vEthernet (External Virtual Switch):

ScReW yOu gUyS. I aM GOinG hoMe. —————————————————————— For heaven's sake, can you write and describe your issue based on plain fact, common logic and a methodologic approach? Appreciate it.
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#3
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Re:Static DHCP Issues related to DHCP Lease Expires
2023-09-11 03:13:56

Hi @mlatta 

Thanks for posting in our business forum.

Sorry that I don't understand the question.

First, if you are on static IP address, you don't have the lease time. If you are on the IP-MAC binding and DHCP reservation or fixed IP address, then it is normal to have a "permanent" IP. The lease time is 2159, that's right.

Lease time is set in the LAN settings.

 

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Re:Static DHCP Issues related to DHCP Lease Expires
2023-09-11 12:14:25

Tedd404 wrote

 

 

 

ain't this virtual machine IP address? LOL.

i think virtual machine would get something like this, unless you modify its NAT mode. 

 

Ethernet adapter vEthernet (External Virtual Switch):

  @Tedd404 

It is actually a Hyper-V virtual Host computer that runs virtual machines.  But a VM will act the same as a bare metal computer when it comes to IP addresses and DCHP.  They all look the same to the router.

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Re:Static DHCP Issues related to DHCP Lease Expires-Solution
2023-09-11 12:26:31 - last edited 2023-09-13 06:54:42

mlatta wrote

For all of my dynamic DHCP leases the lease expire has 120 minutes.

 

For all of my static DHCP leases the lease expire has Expires : October 9, 2159 1:20:03 AM

 

Using router in standalone mode until all of the standalone features are available in the Omada Management Platform which as of this version of the firmware they are not.

 

I have seen reference to other consumer TP-Link routers having this issue of DHCP expiry times. 49710 days, 6 hours, 28 minutes, 15 seconds but related to that article, there was no solution given.

 

If you require additonal information, I can offer that to you.

 

Experienced network admin here so please ask appropriate questions.

 

Thanks.

  @mlatta 

RFC1541 Section 3.3 answers your question, I believe.

datatracker.ietf(dot)org/doc/html/rfc1541ection-3.3

FFFF FFFF converts to 4294967295 decimal, which is in seconds.

4294967295 seconds converts to 136 years 70 days 6 hrs. 28 min. 15 sec.

This is expected per RFC1541.

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#6
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Re:Static DHCP Issues related to DHCP Lease Expires
2023-09-15 21:01:26

  @jg1212 Thank you that does answer the question. Unfortunately, should that ethernet client (PC, MAC, Camera, etc) need to be placed on a different static DHCP IP in the future, you are now forced to reboot / renew the ethernet client to obtain the new static IP being assigned. Not the end of the world but good to know it was not a "bug".

 

It is good to know they are not breaking the RFC1541 setting for infinity but would be nice to have static DHCP IP ethernet clients to check as often as non-static DHCP ethernet clients as many other network vendors offer including TP-Link offers with other products that I have used in the past that have DHCP capabilities.

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