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Evaluation Approaches compared (both e2e and hop): SFTP (simple ftp-like TCP app) – kernel IP forwarding or ‘plug proxy’ MAIL (Sendmail, no ckpoint/restart) (both end to end and DTN (store-and-forward with restart) hop configurations) Compare robustness to interruption / link errors Link up/down patterns: aligned, shifted, sequential, random E2E HOP user kernel user kernel user kernel user kernel |