我租屋的地方牆壁上有一個網路孔
直接把網路線從網路孔接到電腦可以經由 DHCP 取得 IP 上網
但是中間如果有接其他任何裝置都沒辦法經由 DHCP 取得 IP
試過的裝置有
一台普通 5 port Switch Hub，牌子是 TP-LINK TL-SG1005D，支援自動MDI/MDIX
兩台 WIFI 無線 AP
即使我接上去之後，手動設定正確的IP、netmask 以及 gateway 也都沒辦法上網
使用 arp -a 可以看到正確的 gateway IP 以及正確的 MAC Address
但是直接 ping 又 ping 不到
routing table 也是正常的
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.1.1 UGSc 59 0 en0
不知道為什麼會有這種狀況發生
這已經超出我理解範圍了...
已知設備為
中華電信光世代小烏龜 D-Link DSL-7740C
接著一台 D-Link DES-1024D
然後網路線接到各個房間
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Mowd wrote:
已知設備為
中華電信光世代小烏龜 D-Link DSL-7740C
接著一台 D-Link DES-1024D
然後網路線接到各個房間...(恕刪)
問題是未知設備...
看板上這個討論吧...
http://www.mobile01.com/topicdetail.php?f=110&t=2306299
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kcc16896 wrote:
請檢查 D-Link DES-1024D裡面的設定，是否有以下或類似的限制，將其取消應可解決。但串接Hub或AP須有一定網路知識，不然易出問題。
1. DHCP IP RANGE開得夠不夠多
2. DHCP 相關設定是否可RELY或有其他限制，如租期過長，IP太少
3. 檢查MAC或防火牆是否有鎖定IP或限制。
4. 檢查其他進階選項是否有鎖定或限制。
以上，細節樓給樓下解說!
我找了一下，D-Link DES-1024D 只是單純的 Switch Hub，所以沒有提供任何管理設定介面
Edkang wrote:
問題是未知設備...
看板上這個討論吧...
原來還有這種東西
不過，房東放網路設備的地方是公開的，裡面除了中華電信大烏龜，以及那台 D-Link 的 Switch 以外，沒有再接其他設備了
kcc16896 wrote:
補充一下
有些舊的網路設備，交換機或HUB需要使用跳線串接其他網路設備，希望有幫到你!
樓下繼續
我查了一下，D-Link DES-1024D 和我所有的設備都有支援自動 MDI/MDIX，所以可能不是這個問題
我有試著在接上 Switch 後，手動設定正確連線資訊
IP: 192.168.1.111
Netmask: 255.255.255.0
Gateway: 192.168.1.1
$ ifconfig
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=10b<RXCSUM,TXCSUM,VLAN_HWTAGGING,AV>
ether 0c:4d:e9:c3:08:68
inet6 fe80::e4d:e9ff:fec3:868%en0 prefixlen 64 scopeid 0x4
inet 192.168.1.111 netmask 0xffffff00 broadcast 192.168.1.255
nd6 options=1<PERFORMNUD>
media: 100baseTX <full-duplex,flow-control>
status: active
然後我下指令 arp -a
結果居然出現了以下這堆東西
brodcast整個 255.255.255.255.......
不知道到底是哪裡出問題了
$ arp -a
? (1.2.3.4) at (incomplete) on en0 ifscope [ethernet]
? (64.4.23.146) at (incomplete) on en0 ifscope [ethernet]
? (64.4.23.147) at (incomplete) on en0 ifscope [ethernet]
? (64.4.23.149) at (incomplete) on en0 ifscope [ethernet]
? (64.4.23.151) at (incomplete) on en0 ifscope [ethernet]
? (64.4.23.160) at (incomplete) on en0 ifscope [ethernet]
? (64.4.23.162) at (incomplete) on en0 ifscope [ethernet]
? (65.55.223.17) at (incomplete) on en0 ifscope [ethernet]
? (65.55.223.23) at (incomplete) on en0 ifscope [ethernet]
? (65.55.223.27) at (incomplete) on en0 ifscope [ethernet]
? (65.55.223.34) at (incomplete) on en0 ifscope [ethernet]
? (65.55.223.41) at (incomplete) on en0 ifscope [ethernet]
? (65.55.223.43) at (incomplete) on en0 ifscope [ethernet]
? (111.221.74.14) at (incomplete) on en0 ifscope [ethernet]
? (111.221.74.15) at (incomplete) on en0 ifscope [ethernet]
? (111.221.74.17) at (incomplete) on en0 ifscope [ethernet]
? (111.221.74.34) at (incomplete) on en0 ifscope [ethernet]
? (111.221.74.39) at (incomplete) on en0 ifscope [ethernet]
? (111.221.74.48) at (incomplete) on en0 ifscope [ethernet]
? (111.221.77.148) at (incomplete) on en0 ifscope [ethernet]
? (111.221.77.150) at (incomplete) on en0 ifscope [ethernet]
? (111.221.77.155) at (incomplete) on en0 ifscope [ethernet]
? (111.221.77.156) at (incomplete) on en0 ifscope [ethernet]
? (111.221.77.162) at (incomplete) on en0 ifscope [ethernet]
? (111.221.77.169) at (incomplete) on en0 ifscope [ethernet]
? (111.221.77.173) at (incomplete) on en0 ifscope [ethernet]
? (157.55.56.156) at (incomplete) on en0 ifscope [ethernet]
? (157.55.56.165) at (incomplete) on en0 ifscope [ethernet]
? (157.55.56.167) at (incomplete) on en0 ifscope [ethernet]
? (157.55.130.142) at (incomplete) on en0 ifscope [ethernet]
? (157.55.130.143) at (incomplete) on en0 ifscope [ethernet]
? (157.55.130.145) at (incomplete) on en0 ifscope [ethernet]
? (157.55.130.147) at (incomplete) on en0 ifscope [ethernet]
? (157.55.130.167) at (incomplete) on en0 ifscope [ethernet]
? (157.55.130.175) at (incomplete) on en0 ifscope [ethernet]
? (157.55.235.145) at (incomplete) on en0 ifscope [ethernet]
? (157.55.235.146) at (incomplete) on en0 ifscope [ethernet]
? (157.55.235.151) at (incomplete) on en0 ifscope [ethernet]
? (157.55.235.169) at (incomplete) on en0 ifscope [ethernet]
? (157.55.235.171) at (incomplete) on en0 ifscope [ethernet]
? (157.56.52.14) at (incomplete) on en0 ifscope [ethernet]
? (157.56.52.17) at (incomplete) on en0 ifscope [ethernet]
? (157.56.52.19) at (incomplete) on en0 ifscope [ethernet]
? (157.56.52.34) at (incomplete) on en0 ifscope [ethernet]
? (157.56.52.39) at (incomplete) on en0 ifscope [ethernet]
? (157.56.52.43) at (incomplete) on en0 ifscope [ethernet]
? (157.56.52.44) at (incomplete) on en0 ifscope [ethernet]
? (157.56.53.43) at (incomplete) on en0 ifscope [ethernet]
? (157.56.53.48) at (incomplete) on en0 ifscope [ethernet]
? (169.254.255.255) at (incomplete) on en1 [ethernet]
? (192.168.1.1) at ec:22:80:a6:55:39 on en1 ifscope [ethernet]
? (192.168.1.102) at 0:26:ab:e9:8b:b3 on en1 ifscope [ethernet]
? (192.168.1.113) at (incomplete) on en1 ifscope [ethernet]
? (192.168.1.255) at ff:ff:ff:ff:ff:ff on en1 ifscope [ethernet]
? (213.199.179.146) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.147) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.149) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.155) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.159) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.160) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.162) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.167) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.175) at (incomplete) on en0 ifscope [ethernet]
? (213.199.179.176) at (incomplete) on en0 ifscope [ethernet]
? (224.0.0.251) at 1:0:5e:0:0:fb on en0 ifscope permanent [ethernet]
? (239.255.255.250) at 1:0:5e:7f:ff:fa on en0 ifscope permanent [ethernet]
broadcasthost (255.255.255.255) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]
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cscworm wrote:
電腦先接牆壁上的網路孔，然後ping分享器，查看TTL是否過低，有可能TTL被修改了，導致無法接二級路由，私接網路設備都會失敗。
不過有方法可以解決，先查看看是不是這個問題吧！
TTL看起來好像正常？
$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: icmp_seq=0 ttl=64 time=1.055 ms
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.731 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.503 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.555 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.825 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.667 ms
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kcc16896 wrote:
應該是房東找專業的網管把CORE SWITCH的設定改成不能介接其他網路設備，以免頻寬被搶或亂接無限AP，我看是無解了!不然你就要試試看駭進去SWITCH改設定，被告或被抓不要找我~~~~~~~
這台switch我查過了，沒有設定頁面，他只是一台很普通的switch hub
其實我後來也有直接把我的網路線從switch拔起來，直接接到中華電信光世代小烏龜 D-Link DSL-7740C 這台上面
因為 IP 其實是小烏龜發的，但是一樣取不到 IP...
經過思考只有這幾種可能性
1. 從Switch到我房間網路孔之間，真的有某些神奇設備阻擋自行接 switch，有辦法查嗎？
2. 中華電信光世代小烏龜 D-Link DSL-7740C 這台被設了某些設定，因為這台還蠻多可以設的，很多我都看不懂XD
因為這台中華電信光世代小烏龜有開 Wifi，所以目前我是找一台 Wifi AP，用 Wifi Bridge Mode，如此可以連無線，這台 Wifi AP 後面的網路孔也可以串接其他有線網路並且正常用 DHCP 取得 IP
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