Cisco 877 - not working with apple devices

Question

Hello all,
I'm hoping someone can help me with a problem I have with my 877 adsl router.
A bit of background:
I have set this up as my home router to the internet,  which is connected to a Linksys WRT54GL as a wireless access point.
My windows & Linux devices/laptops all work fine over this setup and connect without a problem
However, all my apple devices, phones and ipads don't fully work. I can get to google and a handful of pages,  but not the store or games or facebook etc. (my daughter thinks its the end of the world - without FB and instagram)
If I take out the Cisco and put a Thompson router in, it all works fine. so I'm assuming it something with the Cisco config.
Below is the config I'm using on the router
Any pointers would be most appreciated.
ddhrouter#sh run
Building configuration...
Current configuration : 2292 bytes
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname ddhrouter
boot-start-marker
boot-end-marker
enable secret 5 mysecret
no aaa new-model
dot11 syslog
ip cef
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1
ip dhcp pool CISCODHCP
   network 192.168.1.0 255.255.255.0
   dns-server 212.50.160.100 213.249.130.100 8.8.8.8
   default-router 192.168.1.1
ip name-server 212.50.160.100
ip name-server 213.249.130.100
ip name-server 8.8.8.8
username cisco privilege 15 password 0 mysecret
archive
 log config
  hidekeys
interface ATM0
 description ** adsl interface **
 mtu 1452
 no ip address
 load-interval 30
 no atm ilmi-keepalive
 pvc 1/50
  ubr 288
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 dsl operating-mode auto
 hold-queue 224 in
interface FastEthernet0
interface FastEthernet1
interface FastEthernet2
interface FastEthernet3
interface Vlan1
 description ** local lan **
 ip address 192.168.1.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 hold-queue 100 out
interface Dialer0
 no ip address
interface Dialer10
 description ** adsl dialer interface **
 ip address negotiated
 ip mtu 1482
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 dialer pool 1
 ppp chap hostname myusername
 ppp chap password 0 mypassword
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer10
no ip http server
no ip http secure-server
ip http max-connections 4
ip http timeout-policy idle 600 life 86400 requests 10000
ip nat inside source list 1 interface Dialer10 overload
ip access-list extended TerminalAccess
 permit tcp host 192.168.1.0 any eq telnet
 permit tcp any any eq 22
 deny   tcp any any
ip access-list extended no_telnet
 deny   tcp any any eq telnet
access-list 1 remark INSIDE_IF=Ethernet0
access-list 1 remark SDM_ACL Category=2
access-list 1 permit 192.0.0.0 0.255.255.255
access-list 110 permit icmp any any echo
access-list 110 permit icmp any any echo-reply
dialer-list 1 protocol ip permit
control-plane
line con 0
 password password
 no modem enable
line aux 0
line vty 0 4
 access-class TerminalAccess in
 password password
 login
scheduler max-task-time 5000
end
ddhrouter#
all I'm after is a standard setup for my router. allow any out - deny any in.
Many thanks in advance.
Dave

Answer 1

ooo, you left your username, password, and enable in in clear text in the config you pasted, as well as not having an outside ACL applied and the VTY ACL allowing ssh from anywhere.  Luckily the outside IP address isn't in the config or I'm sure someone would get ahold of your router....:)  You should apply an outside access list and a firewall (I prefer CBAC firewall config for ease of use, but there is Zone based) to fix this.  I assume ACL 110 was meant to be your outside ACL but it just isn't applied.
That being said Jody is likely right.  PPPoE requires you to shrink your packet size (MTU/MSS) to allow room for the encapsulation that gets added to the packet.  The command he supplied should fix this. 
The 'ip mtu 1482' on the dialer interface may be too large as well.