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Linux Increasing The Transmit Queue Length (txqueuelen)

How do I set txqueuelen (the length of the transmit queue) length of the network card device under Linux? How do I set it for a high latency and/or a high speed network for bulk transfer from disturbing interactive traffic like ssh too much?
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Linux Share a Dial Up Internet Connection

Q. My modem is connected to CentOS Linux server. I'm using wvdial to connect to my ISP; I'd like to connect my laptop via same modem. How do I share a dial up Internet account?
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How To Check and Use Serial Ports Under Linux

How do I check and configure serial ports under Linux for various purposes such as modem, connecting null modems or connect a dumb terminal?
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