Linux servers seeing bad download performance behind Sonicwall firewall

Posted by Joshua Penix on Server Fault See other posts from Server Fault or by Joshua Penix
Published on 2010-02-26T21:28:33Z Indexed on 2010/06/08 14:32 UTC
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Filed under:

linux

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networking

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sonicwall

I'm working with a pair of co-located CentOS Linux servers sitting behind a Sonicwall PRO 2040 Enhanced firewall running in transparent bridge mode.

These servers are having a strange problem downloading files more than a few megabytes in size. For example, if I try to wget or FTP a copy of the Linux kernel from kernel.org, the first ~1-2MB will download at 600+K/s, and then throughput will drop off a cliff to 1K/s.

I've reviewed all the firewall configuration settings for anything suspicious, but found nothing. More interestingly, I performed the same download with a Windows server sitting behind the same firewall, and it sailed right through at 600+K/s the whole way.

Has anyone seen this? Where should I start looking to troubleshoot this problem?

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