Wind River Support Network


LIN6-12299 : wrlinux 5 - dhcpd opening additional random ports

Created: Feb 6, 2017    Updated: Dec 3, 2018
Resolved Date: Feb 8, 2017
Previous ID: LIN5-22419
Found In Version:
Fix Version:
Severity: Standard
Applicable for: Wind River Linux 6
Component/s: Userspace


When configuring dhcpd service on WRL5 we see additional port that is open, which is not really needed. 

It may cause security issues under unknown circumstances, especially that it was fixed by the community in later version of ISC DHCP. 

WRL5 dhcpd doesn’t contain this fix (it is using Internet Systems Consortium DHCP Server 4.2.3-P2). 

The additional opened port is probably related to DDNS which is not needed for our customer's case and not configured in the dhcpd.conf. 
See this for refercence: 

Steps to Reproduce

1. configure a wrlinux 5 project based on 

--enable-board=intel-xeon-core --enable-build=production --enable-kernel=cgl --enable-rootfs=glibc_cgl --enable-jobs=88 --enable-parallel-pkgbuilds=88 --enable-reconfig --with-layer=wr-dpdk,rcfl --with-template=feature/openssl101e,feature/dpdk-1.7 --enable-bootimage=, --without-layer=, --without-template=wr-cgp/cgp/templates/feature/cgp-full/template.conf,wr-cgp/cgp/templates/feature/cgp-full/,wr-dpdk/templates/default/template.conf,wr-dpdk/templates/default/ --enable-doc-pages=target --enable-addons=wr-rcfl --with-rcpl-version=0038

2. build & boot

3. check the netstat output

netstat -ulpn | fgrep dhc

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