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[lwip-devel] [bug #54281] DHCP request send on reboot does not contain h

From: Jasper Verschueren
Subject: [lwip-devel] [bug #54281] DHCP request send on reboot does not contain hostname option
Date: Wed, 11 Jul 2018 03:53:51 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Follow-up Comment #2, bug #54281 (project lwip):

I looked into following RFCs: 1553 and 2131.
It's not stated when a host name option may be given. 
It's just mentioned as a possible option.

So how did I test this issue?
When my implementation boots it does the needed DHCP communication to get an
IP address etc and it gives it's host name.
If I ping MYHOSTNAME, I get feedback.

Then I unplug the Ethernet connector and plug it back in again.
When plugged in, netif_set_link_up is called which calls dhcp_network_changed
which calls dhcp_reboot. The reboot request message does not contain the host

If I then ping MYHOSTNAME again it does not get resolved. If I look at the DNS
traffic with Wireshark, I get a no such name.

When adding the patch this does work.


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