2.13 (opgave SMC)
1. Kernel DNS cache never expired: there are two DNS cache. One, A, is used for the AP of Router, the other, B, is for DNS proxy at the LAN side. Cache B (DNS proxy) has expired time mechanism, but cache A doesn't. And the source of cache B is from cache A. So when the entries of DNS proxy expired, DNS proxy always update them, and it is no problem, but the data is from the old data of cache A. Then DNS proxy always obtains out-of-date data.
2. Fragmentation issue in ppp mode: When WAN protocol is PPPoE or PPPoA, one host at WAN side pings WAN IP of IAD with large payload, ex 1600, Modem doesn't response.
3. QoS module may under-estimate transmission time of some packets of specific sizes. It results in an increasing delay of voice traffic when using that specific size packets to congest WAN uplink.
4. Fixed LAN DHCP server can't release expired IP due to it stored the wrong leased time.
5. Update DDNS