How DHCP Leases Meet Smart Terminals: Emulation and Modeling

Dynamic Host Configuration Protocol (DHCP) provides dynamic use of IP addresses, but it presents challenges to meet smart terminals with great mobility and transient network access patterns. Existing studies have tried to solve this problem through adjusting DHCP lease, which controls how long a hos...

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Bibliographic Details
Published in:IEEE internet of things journal 2018-02, Vol.5 (1), p.56-68
Main Authors: Li, Fuliang, Wang, Xingwei, Cao, Jiannong, Wang, Renzheng, Bi, Yuanguo
Format: Article
Language:English
Subjects:
Algorithms
Analytical models
Dynamic Host Configuration Protocol (DHCP)
IP networks
lease time
Leases
Load modeling
Local area networks
mobile computing
network protocols
Optimization
Performance evaluation
smart terminals
Transient analysis
Utilization
Wireless LAN
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Summary:Dynamic Host Configuration Protocol (DHCP) provides dynamic use of IP addresses, but it presents challenges to meet smart terminals with great mobility and transient network access patterns. Existing studies have tried to solve this problem through adjusting DHCP lease, which controls how long a host owns an address. However, few studies clearly express the relations among the lease, address utilization and DHCP overhead. In this paper, we uncover how the leases affect address utilization and DHCP overhead with two methods, based on which, we can set the leases for the smart terminals flexibly and judiciously. First of all, we present an emulation technique to evaluate address utilization and DHCP overhead under different leases. It provides an experimental basis for setting the lease for the whole WLAN. Evaluation results show that if the lease is set to 120 min instead of 60 min by default, it can reduce 41.78% DHCP overhead on average and still reserve at least 9.2% address space for the possibly emerging terminals. Then, we model the relationship between the lease and address utilization, as well as the relationship between the lease and DHCP overhead. According to these models, we propose a load-aware DHCP lease time optimization algorithm, which helps to set different leases for each area of the WLAN based on theoretical analysis. Evaluation results show that compared with the default lease for the whole WLAN, a lease combination of {15, 120, 120} for different areas can reduce 36.85% DHCP overhead on average and guarantee there is always 10% available address space.
ISSN:2327-4662
2327-4662
DOI:10.1109/JIOT.2017.2771219