https://bugs.kde.org/show_bug.cgi?id=378259
Bug ID: 378259
Summary: NetworkManager does not send new hostname to DHCP
server
Product: plasma-nm
Version: 5.7.5
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: editor
Assignee: jgrul...@redhat.com
Reporter: ddppezas...@tutanota.com
Target Milestone: ---
Created attachment 104806
--> https://bugs.kde.org/attachment.cgi?id=104806&action=edit
KDE nm-editor dialog IPv4 tab screenshot
Trying to send a different (or blank) hostname to the DHCP request on a
wireless interface (wlp3s0). NetworkManager (and the KDE nm-editor) doesn't
seem to allow this or make this happen, no matter what I tried.
Using vanilla Kubuntu 16.10 Live CD (with security updates current) IPv4 only.
I have observed this issue for a long time on previous versions, though.
Hostname is the default: kubuntu
1. Tried to enter in DHCP Client ID hostname (asdfl87Gad) in nm-editor (see
attached screenshot). This added
dhcp-client-id=asdfl87Gad
to the [ipv4] section of /etc/NetworkManager/system-connections/Guest and added
send dhcp-client-identifier "asdfl87Gad"; # added by NetworkManager
to the end of /var/lib/NetworkManager/dhclient-wlp3s0.conf but there still was
a line
send host-name "kubuntu"; # added by NetworkManager
in that file, and
tcpdump -nvvi wlp3s0 port 68
showed
Hostname Option 12, length 7: "kubuntu"
was still being sent "on the wire"(less)
2. Looked at man NetworkManager (not so useful) and (more useful)
man nm-settings
and found dhcp-hostname (string) and dhcp-send-hostname (boolean, default TRUE)
in the Table 13. ipv4 setting section. Added
dhcp-hostname=asdfl87Gad
dhcp-send-hostname=true
to the [ipv4] section of /etc/NetworkManager/system-connections/Guest but
tcpdump still showed
Hostname Option 12, length 7: "kubuntu"
and the end of /var/lib/NetworkManager/dhclient-wlp3s0.conf had
send dhcp-client-identifier "asdfl87Gad"; # added by NetworkManager
send host-name "kubuntu"; # added by NetworkManager
3. On a whim, in /etc/NetworkManager/system-connections/Guest I changed
dhcp-send-hostname=false
and modified /etc/dhcp/dhclient.conf
#send host-name = gethostname();
supersede host-name "asdfl87Gad";
send host-name "asdfl87Gad";
request subnet-mask, broadcast-address, time-offset, routers,
# domain-name, domain-name-servers, domain-search, host-name,
domain-name, domain-name-servers, domain-search,
# dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn,
dhcp6.sntp-servers,
and restarted NetworkManager
service NetworkManager restart
which removed from the end of /var/lib/NetworkManager/dhclient-wlp3s0.conf
send host-name "kubuntu"; # added by NetworkManager
and tcpdump -nvvi wlp3s0 port 68 finally showed
Hostname Option 12, length 10: "asdfl87Gad"
So, while I was able to accomplish this, I had to edit a lot of text files, and
I'm not sure exactly what made it work.
Relevant excerpts from my files follow:
/etc/dhcp/dhclient.conf
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
#send host-name = gethostname();
supersede host-name "asdfl87Gad";
send host-name "asdfl87Gad";
request subnet-mask, broadcast-address, time-offset, routers,
# domain-name, domain-name-servers, domain-search, host-name,
domain-name, domain-name-servers, domain-search,
# dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn,
dhcp6.sntp-servers,
... (SNIP) ...
/etc/NetworkManager/system-connections/Guest
[connection]
id=Guest
uuid=[__MASKED__]
type=wifi
autoconnect=false
permissions=user:kubuntu:;
secondaries=
[wifi]
mac-address-blacklist=
mac-address-randomization=0
mode=infrastructure
seen-bssids=
ssid=Guest
[ipv4]
dhcp-client-id=asdfl87Gad
dhcp-hostname=asdfl87Gad
dhcp-send-hostname=false
dns-search=
ignore-auto-dns=true
may-fail=false
method=auto
[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=link-local
/var/lib/NetworkManager/dhclient-wlp3s0.conf
# Created by NetworkManager
# Merged from /etc/dhcp/dhclient.conf
# Configuration file for /sbin/dhclient.
#
# This is a sample configuration file for dhclient. See dhclient.conf's
# man page for more information about the syntax of this file
# and a more comprehensive list of the parameters understood by
# dhclient.
#
# Normally, if the DHCP server provides reasonable information and does
# not leave anything out (like the domain name, for example), then
# few changes must be made to this file, if any.
#
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
#send host-name = gethostname();
supersede host-name "asdfl87Gad";
send host-name "asdfl87Gad";
request subnet-mask, broadcast-address, time-offset, routers,
# domain-name, domain-name-servers, domain-search, host-name,
domain-name, domain-name-servers, domain-search,
# dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn,
dhcp6.sntp-servers,
... (SNIP) ...
send dhcp-client-identifier "asdfl87Gad"; # added by NetworkManager
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
option ms-classless-static-routes code 249 = array of unsigned integer 8;
option wpad code 252 = string;
also request rfc3442-classless-static-routes;
also request ms-classless-static-routes;
also request static-routes;
also request wpad;
also request ntp-servers;
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