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Showing posts from January, 2012
SMTP NAT with Sendmail
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This post is closely related to my previous one. Big difference is that in this case company we bought had Lotus Notes based email system that had to be kept running concurrently with new common email platform for several months. Well, actually it is still running to some extent over 4 years later but that's another story.
Reliable IP over multiple unrealiable IP links with Linux and Strongswan
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Layer 2 over Layer 3 using Linux built-in features
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Often it's not necessary to encrypt traffic when tunneling L2 network over L3 in corporate environment. I hear, you say use OpenVPN, tinc, gvpe, n2n etc. Now, did you know that there's easy built-in solution that has been part of Linux kernel since 2.6.29? If you need encryption just use IPsec to protect GRE traffic.
Planet WNAP-7300 (Zcomax ZCN-1523H-5) with OpenWrt r29664
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It turned out to be just like I suspected , Planet WNAP-7300 (at least with firmware "2.0.3(PL)4") is exactly same device as Zcomax ZCN-1523H-5. Atheros AR7240 rev. 2 at 350MHz, Atheros AR9280 rev 2 5GHz radio, 32MB RAM, 8MB Flash and two 10/100 Ethernet ports. Therefore it works with Zcomax OpenWrt firmware. Bridge performance seems acceptable, around 70Mbit/s real world in bridged mode and 60Mbit/s if OpenWrt is doing NAT. With around 25 meters nearly line-of-sight performance is ~40Mbit/s. All tests uni-directional TCP (FTP/HTTP) with no other traffic than ICMP echo going on at the same time.
Running Mac OSX Lion 10.7.2 with VMware Workstation 8.0.1 for Linux
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Bridging networks with OpenWrt (r29611) using L2TPv3
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Unpacking Planet Tech. Corp. WNAP-7200 and WNAP-7300 wireless APfirmware
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