Help me: Use iptablesdhcpsquid To implement transparent proxy for multiple network segments

For more information, see iptablesdhcpsquid. Squid is installed on a linux (fc6) and transparent proxy is implemented using dhcp and iptables.

The eth0 address is 192.168.8.100, and eth1 is an Internet interface.
Eth0: 1, eth0: 2 ,............ eth0: five sub-interfaces are five network segments: 201.0, 202.0 ,........ 205.0 Dynamic Address Allocation
Configuration file for eth0: 1
DEVICE = eth0: 1
BOOTPROTO = none
BROADCAST = 192.168.201.15
HWADDR = **********
IPADDR = 192.168..1 .1
NETMASK = 255.255.255.255.240
NETWORK = 192.168.201.0
ONBOOT = yes
TYPE = Ethernet
Other similar

Dhcp configuration is
Subnet 192.168.201.0 netmask 255.255.255.248 {
Default-lease-time 86400;
Max-lease-time 259200;
Option routers 192.168..1 .1;
Option subnet-mask quota limit 248;
Option nis-domain "domain.org ";
Option domain-name "domain.org ";
Option time-offset-18000;
Option domain-name-servers: Public Network dns Server
Host pc1 {hardware ethernet :........
Fixed-address:...}. Other network segments are similar.
Iptables implements transparent proxy statement
Echo "1">/proc/sys/net/ipv4/ip_forward
Iptables-t nat-a postrouting-j MASQUERADE
Iptables-t nat-a prerouting-I eth0-p tcp-s 192.168.8.0/24 -- dport 80-j DNAT -- to 192.168.8.100: 3128
Iptables-t nat-a prerouting-I eth0-p tcp-s 192.168..0 .0/29 -- dport 80-j DNAT -- to 192.168..1 .1: 3128
Other CIDR blocks are similar.

Result:
Dhcp allocation is normal
Everything works normally when testing in the eth0 subnet 8.0
However, when testing in the subnet allocated by sub-interfaces such as eth0: 1
　　　
You can ping a common IP address, but you cannot connect to the dns when you ping the dns address.
It took a long time to reach this point, and I felt that it was a step worse than success...
Depressing... please take a look