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「求助」 Gobi4000 (MC7750) 拨号问题
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Heiher
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May 19, 2013, 1:25:16 AM
5/19/13
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to shlug
Hello,
Gobi4000 (MC7750) 收到了,Linux 平台驱动正常,使用 NetworkManager + ModemManager 可以建立连接,wwan0 网络接口的 IP 分配正常(这个模块不同与之前使用的华为模块,它有自己的网络接口,不使用 ppp,难道是内置的PPP?),默认网关也正常,但问题是从 PC 上 ping 外网的所有 IP 都不通(ping 过程中 wwan0 接口只有 RX 包数据上升),而从外网 ping 分配到的 IP 是通的,断开拨号连接后 ping 就不通了。
从上面的现象来看连接和地址分配应该都是正常的,就是 PC 的网络包发不出去,兄弟们帮忙想想办法,谢谢!
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Heiher
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David Pu
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May 19, 2013, 2:58:27 AM
5/19/13
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to sh...@googlegroups.com
现在很多都不走ppp了,走raw ip或者ncm.你看下是否是走ncm.
有的modem不收arp包,ifconfig -arp看下是否是这种情况。
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Heiher
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May 19, 2013, 3:36:31 AM
5/19/13
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to shlug
NCM 是什么东西?怎么确认?
Google 找了半天,发现大家都在尝试使用 Direct IP 方式,与这个模块类似的模式在内核中有个模块 sierra.ko,但我的 USB ID 并不在这之列,我在重新编译内核模块增加进去试试。
2013/5/19 David Pu
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David Pu
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May 19, 2013, 4:13:14 AM
5/19/13
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ncm:network control model. usb cdc 协议的一种
dmesg可以看到usb相关的log.
Heiher
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May 19, 2013, 7:47:47 AM
5/19/13
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看了一下好像是 CDC WDM,这个怎么用什么方式?
2013/5/19 David Pu
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david pu
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May 19, 2013, 10:39:28 PM
5/19/13
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手头没有设备,不过看起来应该是上层应用的问题,因为你网卡设备都出来, ip都分好了,基本和kernel没啥关系了,是不是modem端的什么设置之类的导致的。建议手动敲AT起一下看看,或者ifconfig -arp看下。
2013/5/19 Heiher
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Heiher
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May 19, 2013, 11:11:49 PM
5/19/13
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to shlug
嗯,我也是这么想,想手动建立连接,但从来没成功过,使用 NetworkManager 还有可能分配到IP。
另外在官网上找到了一下, MC7750 说是不支持 Direct IP 的,只能使用 QMI 方式,这个和 AT 还不一样。现在都不知道正确的建立连接的流程应该是什么样子的。
谢谢!
2013/5/20 david pu
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david pu
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May 20, 2013, 12:53:44 AM
5/20/13
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有人说用ModemManager可以,但是NetworkManager有问题:
https://mail.gnome.org/archives/networkmanager-list/2013-April/msg00030.html
2013/5/20 Heiher
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Heiher
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May 20, 2013, 4:29:08 AM
5/20/13
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to shlug
ModemManager 我从来没试成功过,唉。
2013/5/20 david pu
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Heiher
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May 22, 2013, 9:27:40 AM
5/22/13
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to shlug
MC7750 的问题暂时解决了,禁用了 QMI 模式,使用 Legacy PPP 模式,可能是存在内核的 bug 吧,等以后再试试 QMI 方式吧。
Thanks!
2013/5/20 Heiher
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