With connecting up a customer to WiredCountry, some hosts, irrespective of what Operating System they are running, will not load most web pages, send/recieve email, yet the sites are reachable when pinging them.
Some network cards will automatically work around the problem, others won't.
The workaround solution on a Cisco router is to change the TCP MSS option value on SYN packets that traverse through the router (available in IOS 12.2(4)T and higher). This reduces the MSS option value in the TCP SYN packet so that it's smaller than the value in the ip tcp adjust-mss value command, in this case 990 (MTU minus the size of the IP, TCP, and GRE headers). The end hosts now send TCP/IP packets no larger than this value.
interface Dialer0 ip tcp adjust-mss 990
interface Ethernet1 description Wired Country Broadband Network no ip address ! Set the load-interval at 30 Secs so that usage graphing is more accurate load-interval 30 pppoe enable pppoe-client dial-pool-number 1 hold-queue 100 out ! ! interface Dialer0 description Internet Connection to Wired Country ip address negotiated ! Entries for the FW/ACLs/IDS/IPS ip access-group Internet in ip inspect Internet in ip ips Internet in ! Security Essentials ip verify unicast reverse-path ip virtual-reassembly no ip redirects no ip unreachables no ip proxy-arp no cdp enable ! Frame size adjustments ip mtu 1492 ip tcp adjust-mss 996 ! Assuming that you're running NAT ip nat outside ! Set the load-interval at 30 Secs so that usage graphing is more accurate load-interval 30 ! And your PPP encapsualtion/authenication encapsulation ppp dialer pool 1 dialer-group 1 ppp chap hostname <<username>>@wiredcountry.net.nz ppp chap password <<password>> ppp pap sent-username <<username>>@wiredcountry.net.nz password <<password>> ! Plus extras hold-queue 100 out ! ! dialer-list 1 protocol ip permit
For routers that use an IOS image older than 12.2(13)T image will also need the following configuration commands added in the configuration.
vpdn enable no vpdn logging ! vpdn-group pppoe request-dialin protocol pppoe
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