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FS#2219 - dhcp can not working with some client on v18.06.2 #6058

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openwrt-bot opened this issue Apr 2, 2019 · 5 comments
Closed

FS#2219 - dhcp can not working with some client on v18.06.2 #6058

openwrt-bot opened this issue Apr 2, 2019 · 5 comments
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@openwrt-bot
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scxhwhb:

Supply the following if possible:

  • Device problem occurs on
    D-Team Newifi D2 (Newifi3)
  • Software versions of OpenWrt/LEDE release, packages, etc.
    v18.06.2
  • Steps to reproduce
    I have a floor sweeper that can't connect to the Internet through the openwrt router, but it works under other routers.It is always discover DHCP by viewing the log.
    Tue Apr 2 20:53:02 2019 daemon.info dnsmasq-dhcp[9130]: DHCPDISCOVER(br-lan) b2:59:47:0e:6c:bd
    Tue Apr 2 20:53:02 2019 daemon.info dnsmasq-dhcp[9130]: DHCPOFFER(br-lan) 192.168.1.178 b2:59:47:0e:6c:bd
    Tue Apr 2 20:53:05 2019 daemon.info dnsmasq-dhcp[9130]: DHCPDISCOVER(br-lan) b2:59:47:0e:6c:bd
    Tue Apr 2 20:53:05 2019 daemon.info dnsmasq-dhcp[9130]: DHCPOFFER(br-lan) 192.168.1.178 b2:59:47:0e:6c:bd
    Tue Apr 2 20:53:08 2019 daemon.info dnsmasq-dhcp[9130]: DHCPDISCOVER(br-lan) b2:59:47:0e:6c:bd
    Tue Apr 2 20:53:08 2019 daemon.info dnsmasq-dhcp[9130]: DHCPOFFER(br-lan) 192.168.1.178 b2:59:47:0e:6c:bd
    Tue Apr 2 20:53:11 2019 daemon.info dnsmasq-dhcp[9130]: DHCPDISCOVER(br-lan) b2:59:47:0e:6c:bd
    Tue Apr 2 20:53:11 2019 daemon.info dnsmasq-dhcp[9130]: DHCPOFFER(br-lan) 192.168.1.178 b2:59:47:0e:6c:bd
@openwrt-bot
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dedeckeh:

Looking into the tcpdump traces the NTP option is requested by the client but not present in the DHCP offer.This could be the reason why the client refuses to accept the DHCP offer messages; you could specify 192.168.1.1 as NTP server in the DHCP config

@openwrt-bot
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scxhwhb:

I've tried it but it didn't work. The DHCP offer only on the lo interface but not exists on br-lan interface.I don't think it reached the client at all.

@openwrt-bot
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dedeckeh:

What about other wireless devices; do they get an IP address via DHCP ? If yes you can exclude that DHCP messages do not reach the problematic client.

@openwrt-bot
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scxhwhb:

DHCP offer for other wireless devices is via the br-lan interface, but the problematic client is via lo interface.

@openwrt-bot
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wulfy23:

[bad udp cksum 0xc2f8 -> 0x335e!] @ tos 0xc0

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