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Operating Systems Linux Red Hat Find DHCPv6 server's IPv6 address Post 302994154 by bshalini on Monday 20th of March 2017 12:41:14 AM
Old 03-20-2017
Find DHCPv6 server's IPv6 address

I want to find out the DHCPv6 server's ip address in the network. I went through the lease files but could find only duid/server-id and not the IPv6 address of the dhcp server. And I couldn't find any commands to get that information. Is there a way to get the DHCPv6 server's IPv6 address?

If I configured my machine to get an IPv4 dhcp address, I can see the lease files having the dhcp server's address. This made me think.. whether DHCP6 servers really expose their IPv6 addresses?

Basically looking for commands or system utility apis to get DHCPv6 server's IPv6 address in suse(sles11,sles12,sled) and red-hat(rhel6.8 and rhel7).
Thanks in advance for your help..
 

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dhcp6c(8)						      System Manager's Manual							 dhcp6c(8)

NAME
dhcp6c - DHCPv6 client daemon SYNOPSIS
dhcp6c [ -vfI ] [ -r all | <address...> ] [ -R <address...> ] [ -P <address...> ] [ -c pathspec ] <interface> DESCRIPTION
dhcp6c is an implementation of the DHCPv6 client. Using DHCPv6 messages and DHCPv6 options, dhcp6c is used to request and configure IPv6 addresses and host network configuration information (e.g., DNS) for a network interface from the DHCPv6 server. It can also be used as a requesting router to request and configure Prefix Del- egation for a subnet. The assigned IPv6 addresses and prefixes are saved as /var/lib/dhcpv6/client6.leasesXXXXXX; this file is used to request the same addresses and prefixes from the DHCPv6 server. Each dhcp6c client has a client DHCP Unique Identifier (DUID); the DUID file is saved as /var/lib/dhcpv6/dhcp6c_duid. The dhcp6c client configuration is defined in /etc/dhcp6c.conf. Interface names are specified according to your operating system's conventions. On Linux, this is typically eth0, eth1, and so on. OPTIONS
-c pathspec Specifies the configuration file for dhcp6c -v Enables dhcp6c to print debugging messages. -f Enables dhcp6c to work as a foreground application. This option is helpful for debugging. -I Allows dhcp6c to request network information only. Do not configure the interface. -r all | <addresses...> Allows dhcp6c to release the addresses specified. This option is used only when releasing addresses explicitly. -R <addresses...> Allows dhcp6c to request the specified named addresses. -P <addresses...> Allows dhcp6c to request the specified prefix delegation addresses. FILES
/etc/dhcp6c.conf Contains DHCPv6 client configuration information. /var/lib/dhcpv6/dhcp6c_duid Contains DHCPv6 client DUID. /var/lib/dhcpv6/client6_leasesXXXXXX Contains DHCPv6 client assigned IPv6 addresses and prefixes. ERRORS
Check /var/log/messages if there are errors. SEE ALSO
dhcp6c.conf(5) BUGS
Report bugs via http://fedorahosted.org/dhcpv6/ AUTHORS
See http://fedorahosted.org/dhcpv6/wiki/Authors dhcp6c(8)
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