Re: ip forwarding/masquerading and dhcpd

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If the device doesn't get an address, you're still before the iptables/forwarding stage.

Look in your log files for DHCP messages.

Bill


On 9/6/2017 3:46 PM, JD wrote:
Hi,
My em1 is config'ed as:
ifconfig em1 inet 10.10.10.1 up netmask 0xffffff00

The wifi is connected to and internet and working OK.

em1 is the lan.

I have the following /etc/dhcp/dhcpd.conf  file

DHCPDARGS=em1;
ddns-update-style interim;
subnet 10.10.10.0 netmask       255.255.255.0 {
option subnet-mask              255.255.255.0;
broadcast-address               10.10.10.255;
clientsoption routers           10.10.10.1;
option domain-name-servers      10.10.10.1;
}

I execute:
sudo systemctl start dhcpd
and I see it is running:
ps -ef | grep dhcpd
dhcpd    24671     1  0 19:30 ?        00:00:00 /usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -user dhcpd -group dhcpd --no-pid


However, the client, an old skype phone (from the days before MS bought skype),
is unable to connect and obtain an ip addy.

I have ip forwarding enabled:

echo 1 > /proc/sys/net/ipv4/ip_forward
/sbin/iptables -A FORWARD -i wlp12s0 -o em1 -m state --state ESTABLISHED -j ACCEPT
/sbin/iptables -A FORWARD -i em1 -o wlp12s0 -m state --state ESTABLISHED -j ACCEPT
/sbin/iptables -A FORWARD -i em1 -o wlp12s0          -j ACCEPT
/sbin/iptables -A FORWARD -i wlp12s0 -o em1                              -j ACCEPT
/sbin/iptables -t nat -A POSTROUTING -o wlp12s0                          -j MASQUERADE
/sbin/iptables -t nat -A POSTROUTING -o em1              -j MASQUERADE

So, there must be a problem with the ip forwarding, and / or the dhcpd.conf file ???
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