sudo lsof -i -Pn | grep :67
cat /proc/sys/net/ipv4/ip_forward
cat /etc/iptables.up.rules
?
root@mvtserver:/home/mvt# lsof -i -Pn | grep :67
deluged 1435 mvt 22u IPv4 9639 0t0 UDP *:6771
deluged 1435 mvt 24u IPv4 9640 0t0 UDP 127.0.0.1:6771
deluged 1435 mvt 26u IPv4 9642 0t0 UDP 172.16.0.1:6771
deluged 1435 mvt 28u IPv4 9644 0t0 UDP 172.29.4.150:6771
deluged 1435 mvt 30u IPv4 9646 0t0 UDP 212.21.13.170:6771
dhcpd 2472 dhcpd 7u IPv4 11828 0t0 UDP *:67
root@mvtserver:/home/mvt# cat /proc/sys/net/ipv4/ip_forward
1
root@mvtserver:/home/mvt# cat /etc/iptables.up.rules
# Generated by iptables-save v1.4.12 on Mon Jun 11 00:56:10 2012
*nat
:PREROUTING ACCEPT [35:4149]
:INPUT ACCEPT [19:2358]
:OUTPUT ACCEPT [34:3923]
:POSTROUTING ACCEPT [7:721]
-A POSTROUTING -o ppp0 -j MASQUERADE
COMMIT
# Completed on Mon Jun 11 00:56:10 2012
# Generated by iptables-save v1.4.12 on Mon Jun 11 00:56:10 2012
*filter
:INPUT ACCEPT [230:28483]
:FORWARD ACCEPT [23:6451]
:OUTPUT ACCEPT [227:27292]
COMMIT
# Completed on Mon Jun 11 00:56:10 2012
# Generated by iptables-save v1.4.12 on Mon Jun 11 00:56:10 2012
*mangle
:PREROUTING ACCEPT [2263:262645]
:INPUT ACCEPT [1915:231890]
:FORWARD ACCEPT [249:19651]
:OUTPUT ACCEPT [1943:216325]
:POSTROUTING ACCEPT [2251:243628]
-A FORWARD -o ppp0 -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1400:65495 -j TCPMSS --clamp-mss-to-pmtu
COMMIT
# Completed on Mon Jun 11 00:56:10 2012
root@mvtserver:/home/mvt#